diff --git a/src/applications/differential/controller/DifferentialChangesetViewController.php b/src/applications/differential/controller/DifferentialChangesetViewController.php
index 060892436e..aab16791ca 100644
--- a/src/applications/differential/controller/DifferentialChangesetViewController.php
+++ b/src/applications/differential/controller/DifferentialChangesetViewController.php
@@ -1,381 +1,362 @@
 <?php
 
 final class DifferentialChangesetViewController extends DifferentialController {
 
   public function shouldAllowPublic() {
     return true;
   }
 
   public function processRequest() {
     $request = $this->getRequest();
 
     $author_phid = $request->getUser()->getPHID();
 
     $rendering_reference = $request->getStr('ref');
     $parts = explode('/', $rendering_reference);
     if (count($parts) == 2) {
       list($id, $vs) = $parts;
     } else {
       $id = $parts[0];
       $vs = 0;
     }
 
     $id = (int)$id;
     $vs = (int)$vs;
 
     $load_ids = array($id);
     if ($vs && ($vs != -1)) {
       $load_ids[] = $vs;
     }
 
     $changesets = id(new DifferentialChangesetQuery())
       ->setViewer($request->getUser())
       ->withIDs($load_ids)
       ->needHunks(true)
       ->execute();
     $changesets = mpull($changesets, null, 'getID');
 
     $changeset = idx($changesets, $id);
     if (!$changeset) {
       return new Aphront404Response();
     }
 
     $vs_changeset = null;
     if ($vs && ($vs != -1)) {
       $vs_changeset = idx($changesets, $vs);
       if (!$vs_changeset) {
         return new Aphront404Response();
       }
     }
 
     $view = $request->getStr('view');
     if ($view) {
       $phid = idx($changeset->getMetadata(), "$view:binary-phid");
       if ($phid) {
         return id(new AphrontRedirectResponse())->setURI("/file/info/$phid/");
       }
       switch ($view) {
         case 'new':
           return $this->buildRawFileResponse($changeset, $is_new = true);
         case 'old':
           if ($vs_changeset) {
             return $this->buildRawFileResponse($vs_changeset, $is_new = true);
           }
           return $this->buildRawFileResponse($changeset, $is_new = false);
         default:
           return new Aphront400Response();
       }
     }
 
     if (!$vs) {
       $right = $changeset;
       $left  = null;
 
       $right_source = $right->getID();
       $right_new = true;
       $left_source = $right->getID();
       $left_new = false;
 
       $render_cache_key = $right->getID();
     } else if ($vs == -1) {
       $right = null;
       $left = $changeset;
 
       $right_source = $left->getID();
       $right_new = false;
       $left_source = $left->getID();
       $left_new = true;
 
       $render_cache_key = null;
     } else {
       $right = $changeset;
       $left = $vs_changeset;
 
       $right_source = $right->getID();
       $right_new = true;
       $left_source = $left->getID();
       $left_new = true;
 
       $render_cache_key = null;
     }
 
     if ($left) {
       $left_data = $left->makeNewFile();
       if ($right) {
         $right_data = $right->makeNewFile();
       } else {
         $right_data = $left->makeOldFile();
       }
 
       $engine = new PhabricatorDifferenceEngine();
       $synthetic = $engine->generateChangesetFromFileContent(
         $left_data,
         $right_data);
 
       $choice = clone nonempty($left, $right);
       $choice->attachHunks($synthetic->getHunks());
 
       $changeset = $choice;
     }
 
     $coverage = null;
     if ($right && $right->getDiffID()) {
       $unit = id(new DifferentialDiffProperty())->loadOneWhere(
         'diffID = %d AND name = %s',
         $right->getDiffID(),
         'arc:unit');
 
       if ($unit) {
         $coverage = array();
         foreach ($unit->getData() as $result) {
           $result_coverage = idx($result, 'coverage');
           if (!$result_coverage) {
             continue;
           }
           $file_coverage = idx($result_coverage, $right->getFileName());
           if (!$file_coverage) {
             continue;
           }
           $coverage[] = $file_coverage;
         }
 
         $coverage = ArcanistUnitTestResult::mergeCoverage($coverage);
       }
     }
 
     $spec = $request->getStr('range');
     list($range_s, $range_e, $mask) =
       DifferentialChangesetParser::parseRangeSpecification($spec);
 
-    $parser = new DifferentialChangesetParser();
-    $parser->setCoverage($coverage);
-    $parser->setChangeset($changeset);
-    $parser->setRenderingReference($rendering_reference);
-    $parser->setRenderCacheKey($render_cache_key);
-    $parser->setRightSideCommentMapping($right_source, $right_new);
-    $parser->setLeftSideCommentMapping($left_source, $left_new);
+    $parser = id(new DifferentialChangesetParser())
+      ->setCoverage($coverage)
+      ->setChangeset($changeset)
+      ->setRenderingReference($rendering_reference)
+      ->setRenderCacheKey($render_cache_key)
+      ->setRightSideCommentMapping($right_source, $right_new)
+      ->setLeftSideCommentMapping($left_source, $left_new);
 
     $parser->readParametersFromRequest($request);
 
     if ($left && $right) {
       $parser->setOriginals($left, $right);
     }
 
     // Load both left-side and right-side inline comments.
     $inlines = $this->loadInlineComments(
       array($left_source, $right_source),
       $author_phid);
 
     if ($left_new) {
       $inlines = array_merge(
         $inlines,
         $this->buildLintInlineComments($left));
     }
 
     if ($right_new) {
       $inlines = array_merge(
         $inlines,
         $this->buildLintInlineComments($right));
     }
 
     $phids = array();
     foreach ($inlines as $inline) {
       $parser->parseInlineComment($inline);
       if ($inline->getAuthorPHID()) {
         $phids[$inline->getAuthorPHID()] = true;
       }
     }
     $phids = array_keys($phids);
 
     $handles = $this->loadViewerHandles($phids);
     $parser->setHandles($handles);
 
     $engine = new PhabricatorMarkupEngine();
     $engine->setViewer($request->getUser());
 
     foreach ($inlines as $inline) {
       $engine->addObject(
         $inline,
         PhabricatorInlineCommentInterface::MARKUP_FIELD_BODY);
     }
 
     $engine->process();
-    $parser->setMarkupEngine($engine);
-    $parser->setUser($request->getUser());
-
-    if ($request->isAjax()) {
-      $parser->setShowEditAndReplyLinks(true);
-    } else {
-      $parser->setShowEditAndReplyLinks(false);
-    }
-
-    $output = $parser->render($range_s, $range_e, $mask);
 
-    $mcov = $parser->renderModifiedCoverage();
+    $parser
+      ->setUser($request->getUser())
+      ->setMarkupEngine($engine)
+      ->setShowEditAndReplyLinks(true)
+      ->setRange($range_s, $range_e)
+      ->setMask($mask);
 
     if ($request->isAjax()) {
+      $mcov = $parser->renderModifiedCoverage();
+
       $coverage = array(
         'differential-mcoverage-'.md5($changeset->getFilename()) => $mcov,
       );
 
       return id(new PhabricatorChangesetResponse())
-        ->setRenderedChangeset($output)
+        ->setRenderedChangeset($parser->renderChangeset())
         ->setCoverage($coverage);
     }
 
-    // TODO: [HTML] Clean up DifferentialChangesetParser output, but it's
-    // undergoing like six kinds of refactoring anyway.
-    $output = phutil_safe_html($output);
+    $diff = $changeset->getDiff();
 
-    $detail = id(new DifferentialChangesetDetailView())
+    $detail = id(new DifferentialChangesetListView())
       ->setUser($this->getViewer())
-      ->setChangeset($changeset)
-      ->setRenderingRef($rendering_reference)
+      ->setChangesets(array($changeset))
+      ->setVisibleChangesets(array($changeset))
+      ->setRenderingReferences(array($rendering_reference))
       ->setRenderURI('/differential/changeset/')
-      ->setRenderer($parser->getRenderer()->getRendererKey())
-      ->appendChild($output)
-      ->setVsChangesetID($left_source);
+      ->setDiff($diff)
+      ->setTitle(pht('Standalone View'))
+      ->setParser($parser);
 
-    Javelin::initBehavior('differential-populate', array(
-      'changesetViewIDs' => array($detail->getID()),
-    ));
-
-    Javelin::initBehavior('differential-comment-jump', array());
-
-    $panel = new DifferentialPrimaryPaneView();
-    $panel->appendChild(
-      phutil_tag(
-      'div',
-      array(
-        'class' => 'differential-review-stage',
-        'id'    => 'differential-review-stage',
-      ),
-      $detail->render()));
+    $revision_id = $diff->getRevisionID();
+    if ($revision_id) {
+      $detail->setInlineCommentControllerURI(
+        '/differential/comment/inline/edit/'.$revision_id.'/');
+    }
 
     $crumbs = $this->buildApplicationCrumbs();
 
-    $revision_id = $changeset->getDiff()->getRevisionID();
     if ($revision_id) {
       $crumbs->addTextCrumb('D'.$revision_id, '/D'.$revision_id);
     }
 
-    $diff_id = $changeset->getDiff()->getID();
+    $diff_id = $diff->getID();
     if ($diff_id) {
       $crumbs->addTextCrumb(
         pht('Diff %d', $diff_id),
         $this->getApplicationURI('diff/'.$diff_id));
     }
 
     $crumbs->addTextCrumb($changeset->getDisplayFilename());
 
-    $box = id(new PHUIObjectBoxView())
-      ->setHeaderText(pht('Standalone View'))
-      ->appendChild($panel);
-
     return $this->buildApplicationPage(
       array(
         $crumbs,
-        $box,
+        $detail,
       ),
       array(
         'title' => pht('Changeset View'),
         'device' => false,
       ));
   }
 
   private function loadInlineComments(array $changeset_ids, $author_phid) {
     $changeset_ids = array_unique(array_filter($changeset_ids));
     if (!$changeset_ids) {
       return;
     }
 
     return id(new DifferentialInlineCommentQuery())
       ->withViewerAndChangesetIDs($author_phid, $changeset_ids)
       ->execute();
   }
 
   private function buildRawFileResponse(
     DifferentialChangeset $changeset,
     $is_new) {
 
     $viewer = $this->getRequest()->getUser();
 
     if ($is_new) {
       $key = 'raw:new:phid';
     } else {
       $key = 'raw:old:phid';
     }
 
     $metadata = $changeset->getMetadata();
 
     $file = null;
     $phid = idx($metadata, $key);
     if ($phid) {
       $file = id(new PhabricatorFileQuery())
         ->setViewer($viewer)
         ->withPHIDs(array($phid))
         ->execute();
       if ($file) {
         $file = head($file);
       }
     }
 
     if (!$file) {
       // This is just building a cache of the changeset content in the file
       // tool, and is safe to run on a read pathway.
       $unguard = AphrontWriteGuard::beginScopedUnguardedWrites();
 
       if ($is_new) {
         $data = $changeset->makeNewFile();
       } else {
         $data = $changeset->makeOldFile();
       }
 
       $file = PhabricatorFile::newFromFileData(
         $data,
         array(
           'name'      => $changeset->getFilename(),
           'mime-type' => 'text/plain',
         ));
 
       $metadata[$key] = $file->getPHID();
       $changeset->setMetadata($metadata);
       $changeset->save();
 
       unset($unguard);
     }
 
     return $file->getRedirectResponse();
   }
 
   private function buildLintInlineComments($changeset) {
     $lint = id(new DifferentialDiffProperty())->loadOneWhere(
       'diffID = %d AND name = %s',
       $changeset->getDiffID(),
       'arc:lint');
     if (!$lint) {
       return array();
     }
     $lint = $lint->getData();
 
     $inlines = array();
     foreach ($lint as $msg) {
       if ($msg['path'] != $changeset->getFilename()) {
         continue;
       }
       $inline = new DifferentialInlineComment();
       $inline->setChangesetID($changeset->getID());
       $inline->setIsNewFile(1);
       $inline->setSyntheticAuthor('Lint: '.$msg['name']);
       $inline->setLineNumber($msg['line']);
       $inline->setLineLength(0);
 
       $inline->setContent('%%%'.$msg['description'].'%%%');
 
       $inlines[] = $inline;
     }
 
     return $inlines;
   }
 
 }
diff --git a/src/applications/differential/parser/DifferentialChangesetParser.php b/src/applications/differential/parser/DifferentialChangesetParser.php
index cd689153f0..39bb8ce80b 100644
--- a/src/applications/differential/parser/DifferentialChangesetParser.php
+++ b/src/applications/differential/parser/DifferentialChangesetParser.php
@@ -1,1346 +1,1365 @@
 <?php
 
 final class DifferentialChangesetParser {
 
   protected $visible      = array();
   protected $new          = array();
   protected $old          = array();
   protected $intra        = array();
   protected $newRender    = null;
   protected $oldRender    = null;
 
   protected $filename     = null;
   protected $hunkStartLines = array();
 
   protected $comments     = array();
   protected $specialAttributes = array();
 
   protected $changeset;
   protected $whitespaceMode = null;
 
   protected $renderCacheKey = null;
 
   private $handles = array();
   private $user;
 
   private $leftSideChangesetID;
   private $leftSideAttachesToNewFile;
 
   private $rightSideChangesetID;
   private $rightSideAttachesToNewFile;
 
   private $originalLeft;
   private $originalRight;
 
   private $renderingReference;
   private $isSubparser;
 
   private $isTopLevel;
   private $coverage;
   private $markupEngine;
   private $highlightErrors;
   private $disableCache;
   private $renderer;
   private $characterEncoding;
   private $highlightAs;
   private $showEditAndReplyLinks = true;
 
+  private $rangeStart;
+  private $rangeEnd;
+  private $mask;
+
+  public function setRange($start, $end) {
+    $this->rangeStart = $start;
+    $this->rangeEnd = $end;
+    return $this;
+  }
+
+  public function setMask(array $mask) {
+    $this->mask = $mask;
+    return $this;
+  }
+
+  public function renderChangeset() {
+    return $this->render($this->rangeStart, $this->rangeEnd, $this->mask);
+  }
+
   public function setShowEditAndReplyLinks($bool) {
     $this->showEditAndReplyLinks = $bool;
     return $this;
   }
   public function getShowEditAndReplyLinks() {
     return $this->showEditAndReplyLinks;
   }
 
   public function setHighlightAs($highlight_as) {
     $this->highlightAs = $highlight_as;
     return $this;
   }
 
   public function getHighlightAs() {
     return $this->highlightAs;
   }
 
   public function setCharacterEncoding($character_encoding) {
     $this->characterEncoding = $character_encoding;
     return $this;
   }
 
   public function getCharacterEncoding() {
     return $this->characterEncoding;
   }
 
   public function setRenderer(DifferentialChangesetRenderer $renderer) {
     $this->renderer = $renderer;
     return $this;
   }
 
   public function getRenderer() {
     if (!$this->renderer) {
       return new DifferentialChangesetTwoUpRenderer();
     }
     return $this->renderer;
   }
 
   public function setDisableCache($disable_cache) {
     $this->disableCache = $disable_cache;
     return $this;
   }
 
   public function getDisableCache() {
     return $this->disableCache;
   }
 
   public static function getDefaultRendererForViewer(PhabricatorUser $viewer) {
     $prefs = $viewer->loadPreferences();
     $pref_unified = PhabricatorUserPreferences::PREFERENCE_DIFF_UNIFIED;
     if ($prefs->getPreference($pref_unified) == 'unified') {
       return '1up';
     }
     return null;
   }
 
   public function readParametersFromRequest(AphrontRequest $request) {
     $this->setWhitespaceMode($request->getStr('whitespace'));
     $this->setCharacterEncoding($request->getStr('encoding'));
     $this->setHighlightAs($request->getStr('highlight'));
 
     $renderer = null;
 
     // If the viewer prefers unified diffs, always set the renderer to unified.
     // Otherwise, we leave it unspecified and the client will choose a
     // renderer based on the screen size.
 
     if ($request->getStr('renderer')) {
       $renderer = $request->getStr('renderer');
     } else {
       $renderer = self::getDefaultRendererForViewer($request->getViewer());
     }
 
     switch ($renderer) {
       case '1up':
         $this->setRenderer(new DifferentialChangesetOneUpRenderer());
         break;
       default:
         $this->setRenderer(new DifferentialChangesetTwoUpRenderer());
         break;
     }
 
     return $this;
   }
 
   const CACHE_VERSION = 11;
   const CACHE_MAX_SIZE = 8e6;
 
   const ATTR_GENERATED  = 'attr:generated';
   const ATTR_DELETED    = 'attr:deleted';
   const ATTR_UNCHANGED  = 'attr:unchanged';
   const ATTR_WHITELINES = 'attr:white';
   const ATTR_MOVEAWAY   = 'attr:moveaway';
 
   const LINES_CONTEXT = 8;
 
   const WHITESPACE_SHOW_ALL         = 'show-all';
   const WHITESPACE_IGNORE_TRAILING  = 'ignore-trailing';
   const WHITESPACE_IGNORE_MOST      = 'ignore-most';
   const WHITESPACE_IGNORE_ALL       = 'ignore-all';
 
   public function setOldLines(array $lines) {
     $this->old = $lines;
     return $this;
   }
 
   public function setNewLines(array $lines) {
     $this->new = $lines;
     return $this;
   }
 
   public function setSpecialAttributes(array $attributes) {
     $this->specialAttributes = $attributes;
     return $this;
   }
 
   public function setIntraLineDiffs(array $diffs) {
     $this->intra = $diffs;
     return $this;
   }
 
   public function setVisibileLinesMask(array $mask) {
     $this->visible = $mask;
     return $this;
   }
 
   /**
    * Configure which Changeset comments added to the right side of the visible
    * diff will be attached to. The ID must be the ID of a real Differential
    * Changeset.
    *
    * The complexity here is that we may show an arbitrary side of an arbitrary
    * changeset as either the left or right part of a diff. This method allows
    * the left and right halves of the displayed diff to be correctly mapped to
    * storage changesets.
    *
    * @param id    The Differential Changeset ID that comments added to the right
    *              side of the visible diff should be attached to.
    * @param bool  If true, attach new comments to the right side of the storage
    *              changeset. Note that this may be false, if the left side of
    *              some storage changeset is being shown as the right side of
    *              a display diff.
    * @return this
    */
   public function setRightSideCommentMapping($id, $is_new) {
     $this->rightSideChangesetID = $id;
     $this->rightSideAttachesToNewFile = $is_new;
     return $this;
   }
 
   /**
    * See setRightSideCommentMapping(), but this sets information for the left
    * side of the display diff.
    */
   public function setLeftSideCommentMapping($id, $is_new) {
     $this->leftSideChangesetID = $id;
     $this->leftSideAttachesToNewFile = $is_new;
     return $this;
   }
 
   public function setOriginals(
     DifferentialChangeset $left,
     DifferentialChangeset $right) {
 
     $this->originalLeft = $left;
     $this->originalRight = $right;
   }
 
   public function diffOriginals() {
     $engine = new PhabricatorDifferenceEngine();
     $changeset = $engine->generateChangesetFromFileContent(
       implode('', mpull($this->originalLeft->getHunks(), 'getChanges')),
       implode('', mpull($this->originalRight->getHunks(), 'getChanges')));
 
     $parser = new DifferentialHunkParser();
 
     return $parser->parseHunksForHighlightMasks(
       $changeset->getHunks(),
       $this->originalLeft->getHunks(),
       $this->originalRight->getHunks());
   }
 
   /**
    * Set a key for identifying this changeset in the render cache. If set, the
    * parser will attempt to use the changeset render cache, which can improve
    * performance for frequently-viewed changesets.
    *
    * By default, there is no render cache key and parsers do not use the cache.
    * This is appropriate for rarely-viewed changesets.
    *
    * NOTE: Currently, this key must be a valid Differential Changeset ID.
    *
    * @param   string  Key for identifying this changeset in the render cache.
    * @return  this
    */
   public function setRenderCacheKey($key) {
     $this->renderCacheKey = $key;
     return $this;
   }
 
   private function getRenderCacheKey() {
     return $this->renderCacheKey;
   }
 
   public function setChangeset(DifferentialChangeset $changeset) {
     $this->changeset = $changeset;
 
     $this->setFilename($changeset->getFilename());
 
     return $this;
   }
 
   public function setWhitespaceMode($whitespace_mode) {
     $this->whitespaceMode = $whitespace_mode;
     return $this;
   }
 
   public function setRenderingReference($ref) {
     $this->renderingReference = $ref;
     return $this;
   }
 
   private function getRenderingReference() {
     return $this->renderingReference;
   }
 
   public function getChangeset() {
     return $this->changeset;
   }
 
   public function setFilename($filename) {
     $this->filename = $filename;
     return $this;
   }
 
   public function setHandles(array $handles) {
     assert_instances_of($handles, 'PhabricatorObjectHandle');
     $this->handles = $handles;
     return $this;
   }
 
   public function setMarkupEngine(PhabricatorMarkupEngine $engine) {
     $this->markupEngine = $engine;
     return $this;
   }
 
   public function setUser(PhabricatorUser $user) {
     $this->user = $user;
     return $this;
   }
 
   public function getUser() {
     return $this->user;
   }
 
   public function setCoverage($coverage) {
     $this->coverage = $coverage;
     return $this;
   }
   private function getCoverage() {
     return $this->coverage;
   }
 
   public function parseInlineComment(
     PhabricatorInlineCommentInterface $comment) {
 
     // Parse only comments which are actually visible.
     if ($this->isCommentVisibleOnRenderedDiff($comment)) {
       $this->comments[] = $comment;
     }
     return $this;
   }
 
   private function loadCache() {
     $render_cache_key = $this->getRenderCacheKey();
     if (!$render_cache_key) {
       return false;
     }
 
     $data = null;
 
     $changeset = new DifferentialChangeset();
     $conn_r = $changeset->establishConnection('r');
     $data = queryfx_one(
       $conn_r,
       'SELECT * FROM %T WHERE id = %d',
       $changeset->getTableName().'_parse_cache',
       $render_cache_key);
 
     if (!$data) {
       return false;
     }
 
     if ($data['cache'][0] == '{') {
       // This is likely an old-style JSON cache which we will not be able to
       // deserialize.
       return false;
     }
 
     $data = unserialize($data['cache']);
     if (!is_array($data) || !$data) {
       return false;
     }
 
     foreach (self::getCacheableProperties() as $cache_key) {
       if (!array_key_exists($cache_key, $data)) {
         // If we're missing a cache key, assume we're looking at an old cache
         // and ignore it.
         return false;
       }
     }
 
     if ($data['cacheVersion'] !== self::CACHE_VERSION) {
       return false;
     }
 
     // Someone displays contents of a partially cached shielded file.
     if (!isset($data['newRender']) && (!$this->isTopLevel || $this->comments)) {
       return false;
     }
 
     unset($data['cacheVersion'], $data['cacheHost']);
     $cache_prop = array_select_keys($data, self::getCacheableProperties());
     foreach ($cache_prop as $cache_key => $v) {
       $this->$cache_key = $v;
     }
 
     return true;
   }
 
   protected static function getCacheableProperties() {
     return array(
       'visible',
       'new',
       'old',
       'intra',
       'newRender',
       'oldRender',
       'specialAttributes',
       'hunkStartLines',
       'cacheVersion',
       'cacheHost',
     );
   }
 
   public function saveCache() {
     if ($this->highlightErrors) {
       return false;
     }
 
     $render_cache_key = $this->getRenderCacheKey();
     if (!$render_cache_key) {
       return false;
     }
 
     $cache = array();
     foreach (self::getCacheableProperties() as $cache_key) {
       switch ($cache_key) {
         case 'cacheVersion':
           $cache[$cache_key] = self::CACHE_VERSION;
           break;
         case 'cacheHost':
           $cache[$cache_key] = php_uname('n');
           break;
         default:
           $cache[$cache_key] = $this->$cache_key;
           break;
       }
     }
     $cache = serialize($cache);
 
     // We don't want to waste too much space by a single changeset.
     if (strlen($cache) > self::CACHE_MAX_SIZE) {
       return;
     }
 
     $changeset = new DifferentialChangeset();
     $conn_w = $changeset->establishConnection('w');
 
     $unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
       try {
         queryfx(
           $conn_w,
           'INSERT INTO %T (id, cache, dateCreated) VALUES (%d, %B, %d)
             ON DUPLICATE KEY UPDATE cache = VALUES(cache)',
           DifferentialChangeset::TABLE_CACHE,
           $render_cache_key,
           $cache,
           time());
       } catch (AphrontQueryException $ex) {
         // Ignore these exceptions. A common cause is that the cache is
         // larger than 'max_allowed_packet', in which case we're better off
         // not writing it.
 
         // TODO: It would be nice to tailor this more narrowly.
       }
     unset($unguarded);
   }
 
   private function markGenerated($new_corpus_block = '') {
     $generated_guess = (strpos($new_corpus_block, '@'.'generated') !== false);
 
     if (!$generated_guess) {
       $generated_path_regexps = PhabricatorEnv::getEnvConfig(
         'differential.generated-paths');
       foreach ($generated_path_regexps as $regexp) {
         if (preg_match($regexp, $this->changeset->getFilename())) {
           $generated_guess = true;
           break;
         }
       }
     }
 
     $event = new PhabricatorEvent(
       PhabricatorEventType::TYPE_DIFFERENTIAL_WILLMARKGENERATED,
       array(
         'corpus' => $new_corpus_block,
         'is_generated' => $generated_guess,
       )
     );
     PhutilEventEngine::dispatchEvent($event);
 
     $generated = $event->getValue('is_generated');
     $this->specialAttributes[self::ATTR_GENERATED] = $generated;
   }
 
   public function isGenerated() {
     return idx($this->specialAttributes, self::ATTR_GENERATED, false);
   }
 
   public function isDeleted() {
     return idx($this->specialAttributes, self::ATTR_DELETED, false);
   }
 
   public function isUnchanged() {
     return idx($this->specialAttributes, self::ATTR_UNCHANGED, false);
   }
 
   public function isWhitespaceOnly() {
     return idx($this->specialAttributes, self::ATTR_WHITELINES, false);
   }
 
   public function isMoveAway() {
     return idx($this->specialAttributes, self::ATTR_MOVEAWAY, false);
   }
 
   private function applyIntraline(&$render, $intra, $corpus) {
 
     foreach ($render as $key => $text) {
       if (isset($intra[$key])) {
         $render[$key] = ArcanistDiffUtils::applyIntralineDiff(
           $text,
           $intra[$key]);
       }
     }
   }
 
   private function getHighlightFuture($corpus) {
     $language = $this->highlightAs;
 
     if (!$language) {
       $language = $this->highlightEngine->getLanguageFromFilename(
         $this->filename);
     }
 
     return $this->highlightEngine->getHighlightFuture(
       $language,
       $corpus);
   }
 
   protected function processHighlightedSource($data, $result) {
 
     $result_lines = phutil_split_lines($result);
     foreach ($data as $key => $info) {
       if (!$info) {
         unset($result_lines[$key]);
       }
     }
     return $result_lines;
   }
 
   private function tryCacheStuff() {
     $whitespace_mode = $this->whitespaceMode;
     switch ($whitespace_mode) {
       case self::WHITESPACE_SHOW_ALL:
       case self::WHITESPACE_IGNORE_TRAILING:
       case self::WHITESPACE_IGNORE_ALL:
         break;
       default:
         $whitespace_mode = self::WHITESPACE_IGNORE_MOST;
         break;
     }
 
     $skip_cache = ($whitespace_mode != self::WHITESPACE_IGNORE_MOST);
     if ($this->disableCache) {
       $skip_cache = true;
     }
 
     if ($this->characterEncoding) {
       $skip_cache = true;
     }
 
     if ($this->highlightAs) {
       $skip_cache = true;
     }
 
     $this->whitespaceMode = $whitespace_mode;
 
     $changeset = $this->changeset;
 
     if ($changeset->getFileType() != DifferentialChangeType::FILE_TEXT &&
         $changeset->getFileType() != DifferentialChangeType::FILE_SYMLINK) {
 
       $this->markGenerated();
 
     } else {
       if ($skip_cache || !$this->loadCache()) {
         $this->process();
         if (!$skip_cache) {
           $this->saveCache();
         }
       }
     }
   }
 
   private function process() {
     $whitespace_mode = $this->whitespaceMode;
     $changeset = $this->changeset;
 
     $ignore_all = (($whitespace_mode == self::WHITESPACE_IGNORE_MOST) ||
                   ($whitespace_mode == self::WHITESPACE_IGNORE_ALL));
 
     $force_ignore = ($whitespace_mode == self::WHITESPACE_IGNORE_ALL);
 
     if (!$force_ignore) {
       if ($ignore_all && $changeset->getWhitespaceMatters()) {
         $ignore_all = false;
       }
     }
 
     // The "ignore all whitespace" algorithm depends on rediffing the
     // files, and we currently need complete representations of both
     // files to do anything reasonable. If we only have parts of the files,
     // don't use the "ignore all" algorithm.
     if ($ignore_all) {
       $hunks = $changeset->getHunks();
       if (count($hunks) !== 1) {
         $ignore_all = false;
       } else {
         $first_hunk = reset($hunks);
         if ($first_hunk->getOldOffset() != 1 ||
             $first_hunk->getNewOffset() != 1) {
             $ignore_all = false;
         }
       }
     }
 
     if ($ignore_all) {
       $old_file = $changeset->makeOldFile();
       $new_file = $changeset->makeNewFile();
       if ($old_file == $new_file) {
         // If the old and new files are exactly identical, the synthetic
         // diff below will give us nonsense and whitespace modes are
         // irrelevant anyway. This occurs when you, e.g., copy a file onto
         // itself in Subversion (see T271).
         $ignore_all = false;
       }
     }
 
     $hunk_parser = new DifferentialHunkParser();
     $hunk_parser->setWhitespaceMode($whitespace_mode);
     $hunk_parser->parseHunksForLineData($changeset->getHunks());
 
     // Depending on the whitespace mode, we may need to compute a different
     // set of changes than the set of changes in the hunk data (specificaly,
     // we might want to consider changed lines which have only whitespace
     // changes as unchanged).
     if ($ignore_all) {
       $engine = new PhabricatorDifferenceEngine();
       $engine->setIgnoreWhitespace(true);
       $no_whitespace_changeset = $engine->generateChangesetFromFileContent(
         $old_file,
         $new_file);
 
       $type_parser = new DifferentialHunkParser();
       $type_parser->parseHunksForLineData($no_whitespace_changeset->getHunks());
 
       $hunk_parser->setOldLineTypeMap($type_parser->getOldLineTypeMap());
       $hunk_parser->setNewLineTypeMap($type_parser->getNewLineTypeMap());
     }
 
     $hunk_parser->reparseHunksForSpecialAttributes();
 
     $unchanged = false;
     if (!$hunk_parser->getHasAnyChanges()) {
       $filetype = $this->changeset->getFileType();
       if ($filetype == DifferentialChangeType::FILE_TEXT ||
           $filetype == DifferentialChangeType::FILE_SYMLINK) {
         $unchanged = true;
       }
     }
 
     $moveaway = false;
     $changetype = $this->changeset->getChangeType();
     if ($changetype == DifferentialChangeType::TYPE_MOVE_AWAY) {
       $moveaway = true;
     }
 
     $this->setSpecialAttributes(array(
       self::ATTR_UNCHANGED  => $unchanged,
       self::ATTR_DELETED    => $hunk_parser->getIsDeleted(),
       self::ATTR_WHITELINES => !$hunk_parser->getHasTextChanges(),
       self::ATTR_MOVEAWAY   => $moveaway,
     ));
 
     $hunk_parser->generateIntraLineDiffs();
     $hunk_parser->generateVisibileLinesMask();
 
     $this->setOldLines($hunk_parser->getOldLines());
     $this->setNewLines($hunk_parser->getNewLines());
     $this->setIntraLineDiffs($hunk_parser->getIntraLineDiffs());
     $this->setVisibileLinesMask($hunk_parser->getVisibleLinesMask());
     $this->hunkStartLines = $hunk_parser->getHunkStartLines(
       $changeset->getHunks());
 
     $new_corpus = $hunk_parser->getNewCorpus();
     $new_corpus_block = implode('', $new_corpus);
     $this->markGenerated($new_corpus_block);
 
     if ($this->isTopLevel &&
         !$this->comments &&
           ($this->isGenerated() ||
            $this->isUnchanged() ||
            $this->isDeleted())) {
       return;
     }
 
     $old_corpus = $hunk_parser->getOldCorpus();
     $old_corpus_block = implode('', $old_corpus);
     $old_future = $this->getHighlightFuture($old_corpus_block);
     $new_future = $this->getHighlightFuture($new_corpus_block);
     $futures = array(
       'old' => $old_future,
       'new' => $new_future,
     );
     $corpus_blocks = array(
       'old' => $old_corpus_block,
       'new' => $new_corpus_block,
     );
 
     $this->highlightErrors = false;
     foreach (new FutureIterator($futures) as $key => $future) {
       try {
         try {
           $highlighted = $future->resolve();
         } catch (PhutilSyntaxHighlighterException $ex) {
           $this->highlightErrors = true;
           $highlighted = id(new PhutilDefaultSyntaxHighlighter())
             ->getHighlightFuture($corpus_blocks[$key])
             ->resolve();
         }
         switch ($key) {
         case 'old':
           $this->oldRender = $this->processHighlightedSource(
             $this->old,
             $highlighted);
           break;
         case 'new':
           $this->newRender = $this->processHighlightedSource(
             $this->new,
             $highlighted);
           break;
         }
       } catch (Exception $ex) {
         phlog($ex);
         throw $ex;
       }
     }
 
     $this->applyIntraline(
       $this->oldRender,
       ipull($this->intra, 0),
       $old_corpus);
     $this->applyIntraline(
       $this->newRender,
       ipull($this->intra, 1),
       $new_corpus);
   }
 
   private function shouldRenderPropertyChangeHeader($changeset) {
     if (!$this->isTopLevel) {
       // We render properties only at top level; otherwise we get multiple
       // copies of them when a user clicks "Show More".
       return false;
     }
 
     return true;
   }
 
   public function render(
     $range_start  = null,
     $range_len    = null,
     $mask_force   = array()) {
 
     // "Top level" renders are initial requests for the whole file, versus
     // requests for a specific range generated by clicking "show more". We
     // generate property changes and "shield" UI elements only for toplevel
     // requests.
     $this->isTopLevel = (($range_start === null) && ($range_len === null));
     $this->highlightEngine = PhabricatorSyntaxHighlighter::newEngine();
 
     $encoding = null;
     if ($this->characterEncoding) {
       // We are forcing this changeset to be interpreted with a specific
       // character encoding, so force all the hunks into that encoding and
       // propagate it to the renderer.
       $encoding = $this->characterEncoding;
       foreach ($this->changeset->getHunks() as $hunk) {
         $hunk->forceEncoding($this->characterEncoding);
       }
     } else {
       // We're just using the default, so tell the renderer what that is
       // (by reading the encoding from the first hunk).
       foreach ($this->changeset->getHunks() as $hunk) {
         $encoding = $hunk->getDataEncoding();
         break;
       }
     }
 
     $this->tryCacheStuff();
     $render_pch = $this->shouldRenderPropertyChangeHeader($this->changeset);
 
     $rows = max(
       count($this->old),
       count($this->new));
 
     $renderer = $this->getRenderer()
       ->setUser($this->getUser())
       ->setChangeset($this->changeset)
       ->setRenderPropertyChangeHeader($render_pch)
       ->setIsTopLevel($this->isTopLevel)
       ->setOldRender($this->oldRender)
       ->setNewRender($this->newRender)
       ->setHunkStartLines($this->hunkStartLines)
       ->setOldChangesetID($this->leftSideChangesetID)
       ->setNewChangesetID($this->rightSideChangesetID)
       ->setOldAttachesToNewFile($this->leftSideAttachesToNewFile)
       ->setNewAttachesToNewFile($this->rightSideAttachesToNewFile)
       ->setCodeCoverage($this->getCoverage())
       ->setRenderingReference($this->getRenderingReference())
       ->setMarkupEngine($this->markupEngine)
       ->setHandles($this->handles)
       ->setOldLines($this->old)
       ->setNewLines($this->new)
       ->setOriginalCharacterEncoding($encoding)
       ->setShowEditAndReplyLinks($this->getShowEditAndReplyLinks());
 
     $shield = null;
     if ($this->isTopLevel && !$this->comments) {
       if ($this->isGenerated()) {
         $shield = $renderer->renderShield(
           pht(
             'This file contains generated code, which does not normally '.
             'need to be reviewed.'));
       } else if ($this->isMoveAway()) {
         // We put an empty shield on these files. Normally, they do not have
         // any diff content anyway. However, if they come through `arc`, they
         // may have content. We don't want to show it (it's not useful) and
         // we bailed out of fully processing it earlier anyway.
 
         // We could show a message like "this file was moved", but we show
         // that as a change header anyway, so it would be redundant. Instead,
         // just render an empty shield to skip rendering the diff body.
         $shield = '';
       } else if ($this->isUnchanged()) {
         $type = 'text';
         if (!$rows) {
           // NOTE: Normally, diffs which don't change files do not include
           // file content (for example, if you "chmod +x" a file and then
           // run "git show", the file content is not available). Similarly,
           // if you move a file from A to B without changing it, diffs normally
           // do not show the file content. In some cases `arc` is able to
           // synthetically generate content for these diffs, but for raw diffs
           // we'll never have it so we need to be prepared to not render a link.
           $type = 'none';
         }
         $shield = $renderer->renderShield(
           pht('The contents of this file were not changed.'),
           $type);
       } else if ($this->isWhitespaceOnly()) {
         $shield = $renderer->renderShield(
           pht('This file was changed only by adding or removing whitespace.'),
           'whitespace');
       } else if ($this->isDeleted()) {
         $shield = $renderer->renderShield(
           pht('This file was completely deleted.'));
       } else if ($this->changeset->getAffectedLineCount() > 2500) {
         $lines = number_format($this->changeset->getAffectedLineCount());
         $shield = $renderer->renderShield(
           pht(
             'This file has a very large number of changes (%s lines).',
             $lines));
       }
     }
 
     if ($shield !== null) {
       return $renderer->renderChangesetTable($shield);
     }
 
     $old_comments = array();
     $new_comments = array();
     $old_mask = array();
     $new_mask = array();
     $feedback_mask = array();
 
     if ($this->comments) {
       foreach ($this->comments as $comment) {
         $start = max($comment->getLineNumber() - self::LINES_CONTEXT, 0);
         $end = $comment->getLineNumber() +
           $comment->getLineLength() +
           self::LINES_CONTEXT;
         $new_side = $this->isCommentOnRightSideWhenDisplayed($comment);
         for ($ii = $start; $ii <= $end; $ii++) {
           if ($new_side) {
             $new_mask[$ii] = true;
           } else {
             $old_mask[$ii] = true;
           }
         }
       }
 
       foreach ($this->old as $ii => $old) {
         if (isset($old['line']) && isset($old_mask[$old['line']])) {
           $feedback_mask[$ii] = true;
         }
       }
 
       foreach ($this->new as $ii => $new) {
         if (isset($new['line']) && isset($new_mask[$new['line']])) {
           $feedback_mask[$ii] = true;
         }
       }
       $this->comments = msort($this->comments, 'getID');
       foreach ($this->comments as $comment) {
         $final = $comment->getLineNumber() +
           $comment->getLineLength();
         $final = max(1, $final);
         if ($this->isCommentOnRightSideWhenDisplayed($comment)) {
           $new_comments[$final][] = $comment;
         } else {
           $old_comments[$final][] = $comment;
         }
       }
     }
     $renderer
       ->setOldComments($old_comments)
       ->setNewComments($new_comments);
 
     switch ($this->changeset->getFileType()) {
       case DifferentialChangeType::FILE_IMAGE:
         $old = null;
         $new = null;
         // TODO: Improve the architectural issue as discussed in D955
         // https://secure.phabricator.com/D955
         $reference = $this->getRenderingReference();
         $parts = explode('/', $reference);
         if (count($parts) == 2) {
           list($id, $vs) = $parts;
         } else {
           $id = $parts[0];
           $vs = 0;
         }
         $id = (int)$id;
         $vs = (int)$vs;
 
         if (!$vs) {
           $metadata = $this->changeset->getMetadata();
           $data = idx($metadata, 'attachment-data');
 
           $old_phid = idx($metadata, 'old:binary-phid');
           $new_phid = idx($metadata, 'new:binary-phid');
         } else {
           $vs_changeset = id(new DifferentialChangeset())->load($vs);
           $old_phid = null;
           $new_phid = null;
 
           // TODO: This is spooky, see D6851
           if ($vs_changeset) {
             $vs_metadata = $vs_changeset->getMetadata();
             $old_phid = idx($vs_metadata, 'new:binary-phid');
           }
 
           $changeset = id(new DifferentialChangeset())->load($id);
           if ($changeset) {
             $metadata = $changeset->getMetadata();
             $new_phid = idx($metadata, 'new:binary-phid');
           }
         }
 
         if ($old_phid || $new_phid) {
           // grab the files, (micro) optimization for 1 query not 2
           $file_phids = array();
           if ($old_phid) {
             $file_phids[] = $old_phid;
           }
           if ($new_phid) {
             $file_phids[] = $new_phid;
           }
 
           $files = id(new PhabricatorFileQuery())
             ->setViewer($this->getUser())
             ->withPHIDs($file_phids)
             ->execute();
           foreach ($files as $file) {
             if (empty($file)) {
               continue;
             }
             if ($file->getPHID() == $old_phid) {
               $old = $file;
             } else if ($file->getPHID() == $new_phid) {
               $new = $file;
             }
           }
         }
 
         $renderer->attachOldFile($old);
         $renderer->attachNewFile($new);
 
         return $renderer->renderFileChange($old, $new, $id, $vs);
       case DifferentialChangeType::FILE_DIRECTORY:
       case DifferentialChangeType::FILE_BINARY:
         $output = $renderer->renderChangesetTable(null);
         return $output;
     }
 
     if ($this->originalLeft && $this->originalRight) {
       list($highlight_old, $highlight_new) = $this->diffOriginals();
       $highlight_old = array_flip($highlight_old);
       $highlight_new = array_flip($highlight_new);
       $renderer
         ->setHighlightOld($highlight_old)
         ->setHighlightNew($highlight_new);
     }
     $renderer
       ->setOriginalOld($this->originalLeft)
       ->setOriginalNew($this->originalRight);
 
     if ($range_start === null) {
       $range_start = 0;
     }
     if ($range_len === null) {
       $range_len = $rows;
     }
     $range_len = min($range_len, $rows - $range_start);
 
     list($gaps, $mask, $depths) = $this->calculateGapsMaskAndDepths(
       $mask_force,
       $feedback_mask,
       $range_start,
       $range_len);
 
     $renderer
       ->setGaps($gaps)
       ->setMask($mask)
       ->setDepths($depths);
 
     $html = $renderer->renderTextChange(
       $range_start,
       $range_len,
       $rows);
 
     return $renderer->renderChangesetTable($html);
   }
 
   /**
    * This function calculates a lot of stuff we need to know to display
    * the diff:
    *
    * Gaps - compute gaps in the visible display diff, where we will render
    * "Show more context" spacers. If a gap is smaller than the context size,
    * we just display it. Otherwise, we record it into $gaps and will render a
    * "show more context" element instead of diff text below. A given $gap
    * is a tuple of $gap_line_number_start and $gap_length.
    *
    * Mask - compute the actual lines that need to be shown (because they
    * are near changes lines, near inline comments, or the request has
    * explicitly asked for them, i.e. resulting from the user clicking
    * "show more"). The $mask returned is a sparesely populated dictionary
    * of $visible_line_number => true.
    *
    * Depths - compute how indented any given line is. The $depths returned
    * is a sparesely populated dictionary of $visible_line_number => $depth.
    *
    * This function also has the side effect of modifying member variable
    * new such that tabs are normalized to spaces for each line of the diff.
    *
    * @return array($gaps, $mask, $depths)
    */
   private function calculateGapsMaskAndDepths($mask_force,
                                               $feedback_mask,
                                               $range_start,
                                               $range_len) {
 
     // Calculate gaps and mask first
     $gaps = array();
     $gap_start = 0;
     $in_gap = false;
     $base_mask = $this->visible + $mask_force + $feedback_mask;
     $base_mask[$range_start + $range_len] = true;
     for ($ii = $range_start; $ii <= $range_start + $range_len; $ii++) {
       if (isset($base_mask[$ii])) {
         if ($in_gap) {
           $gap_length = $ii - $gap_start;
           if ($gap_length <= self::LINES_CONTEXT) {
             for ($jj = $gap_start; $jj <= $gap_start + $gap_length; $jj++) {
               $base_mask[$jj] = true;
             }
           } else {
             $gaps[] = array($gap_start, $gap_length);
           }
           $in_gap = false;
         }
       } else {
         if (!$in_gap) {
           $gap_start = $ii;
           $in_gap = true;
         }
       }
     }
     $gaps = array_reverse($gaps);
     $mask = $base_mask;
 
     // Time to calculate depth.
     // We need to go backwards to properly indent whitespace in this code:
     //
     //   0: class C {
     //   1:
     //   1:   function f() {
     //   2:
     //   2:     return;
     //   1:
     //   1:   }
     //   0:
     //   0: }
     //
     $depths = array();
     $last_depth = 0;
     $range_end = $range_start + $range_len;
     if (!isset($this->new[$range_end])) {
       $range_end--;
     }
     for ($ii = $range_end; $ii >= $range_start; $ii--) {
       // We need to expand tabs to process mixed indenting and to round
       // correctly later.
       $line = str_replace("\t", '  ', $this->new[$ii]['text']);
       $trimmed = ltrim($line);
       if ($trimmed != '') {
         // We round down to flatten "/**" and " *".
         $last_depth = floor((strlen($line) - strlen($trimmed)) / 2);
       }
       $depths[$ii] = $last_depth;
     }
 
     return array($gaps, $mask, $depths);
   }
 
   /**
    * Determine if an inline comment will appear on the rendered diff,
    * taking into consideration which halves of which changesets will actually
    * be shown.
    *
    * @param PhabricatorInlineCommentInterface Comment to test for visibility.
    * @return bool True if the comment is visible on the rendered diff.
    */
   private function isCommentVisibleOnRenderedDiff(
     PhabricatorInlineCommentInterface $comment) {
 
     $changeset_id = $comment->getChangesetID();
     $is_new = $comment->getIsNewFile();
 
     if ($changeset_id == $this->rightSideChangesetID &&
         $is_new == $this->rightSideAttachesToNewFile) {
         return true;
     }
 
     if ($changeset_id == $this->leftSideChangesetID &&
         $is_new == $this->leftSideAttachesToNewFile) {
         return true;
     }
 
     return false;
   }
 
 
   /**
    * Determine if a comment will appear on the right side of the display diff.
    * Note that the comment must appear somewhere on the rendered changeset, as
    * per isCommentVisibleOnRenderedDiff().
    *
    * @param PhabricatorInlineCommentInterface Comment to test for display
    *              location.
    * @return bool True for right, false for left.
    */
   private function isCommentOnRightSideWhenDisplayed(
     PhabricatorInlineCommentInterface $comment) {
 
     if (!$this->isCommentVisibleOnRenderedDiff($comment)) {
       throw new Exception('Comment is not visible on changeset!');
     }
 
     $changeset_id = $comment->getChangesetID();
     $is_new = $comment->getIsNewFile();
 
     if ($changeset_id == $this->rightSideChangesetID &&
         $is_new == $this->rightSideAttachesToNewFile) {
       return true;
     }
 
     return false;
   }
 
   /**
    * Parse the 'range' specification that this class and the client-side JS
    * emit to indicate that a user clicked "Show more..." on a diff. Generally,
    * use is something like this:
    *
    *   $spec = $request->getStr('range');
    *   $parsed = DifferentialChangesetParser::parseRangeSpecification($spec);
    *   list($start, $end, $mask) = $parsed;
    *   $parser->render($start, $end, $mask);
    *
    * @param string Range specification, indicating the range of the diff that
    *               should be rendered.
    * @return tuple List of <start, end, mask> suitable for passing to
    *               @{method:render}.
    */
   public static function parseRangeSpecification($spec) {
     $range_s = null;
     $range_e = null;
     $mask = array();
 
     if ($spec) {
       $match = null;
       if (preg_match('@^(\d+)-(\d+)(?:/(\d+)-(\d+))?$@', $spec, $match)) {
         $range_s = (int)$match[1];
         $range_e = (int)$match[2];
         if (count($match) > 3) {
           $start = (int)$match[3];
           $len = (int)$match[4];
           for ($ii = $start; $ii < $start + $len; $ii++) {
             $mask[$ii] = true;
           }
         }
       }
     }
 
     return array($range_s, $range_e, $mask);
   }
 
   /**
    * Render "modified coverage" information; test coverage on modified lines.
    * This synthesizes diff information with unit test information into a useful
    * indicator of how well tested a change is.
    */
   public function renderModifiedCoverage() {
     $na = phutil_tag('em', array(), '-');
 
     $coverage = $this->getCoverage();
     if (!$coverage) {
       return $na;
     }
 
     $covered = 0;
     $not_covered = 0;
 
     foreach ($this->new as $k => $new) {
       if (!$new['line']) {
         continue;
       }
 
       if (!$new['type']) {
         continue;
       }
 
       if (empty($coverage[$new['line'] - 1])) {
         continue;
       }
 
       switch ($coverage[$new['line'] - 1]) {
         case 'C':
           $covered++;
           break;
         case 'U':
           $not_covered++;
           break;
       }
     }
 
     if (!$covered && !$not_covered) {
       return $na;
     }
 
     return sprintf('%d%%', 100 * ($covered / ($covered + $not_covered)));
   }
 
   public function detectCopiedCode(
     array $changesets,
     $min_width = 30,
     $min_lines = 3) {
 
     assert_instances_of($changesets, 'DifferentialChangeset');
 
     $map = array();
     $files = array();
     $types = array();
     foreach ($changesets as $changeset) {
       $file = $changeset->getFilename();
       foreach ($changeset->getHunks() as $hunk) {
         $line = $hunk->getOldOffset();
         foreach (explode("\n", $hunk->getChanges()) as $code) {
           $type = (isset($code[0]) ? $code[0] : '');
           if ($type == '-' || $type == ' ') {
             $code = trim(substr($code, 1));
             $files[$file][$line] = $code;
             $types[$file][$line] = $type;
             if (strlen($code) >= $min_width) {
               $map[$code][] = array($file, $line);
             }
             $line++;
           }
         }
       }
     }
 
     foreach ($changesets as $changeset) {
       $copies = array();
       foreach ($changeset->getHunks() as $hunk) {
         $added = array_map('trim', $hunk->getAddedLines());
         for (reset($added); list($line, $code) = each($added); ) {
           if (isset($map[$code])) { // We found a long matching line.
 
             if (count($map[$code]) > 16) {
               // If there are a large number of identical lines in this diff,
               // don't try to figure out where this block came from: the
               // analysis is O(N^2), since we need to compare every line
               // against every other line. Even if we arrive at a result, it
               // is unlikely to be meaningful. See T5041.
               continue 2;
             }
 
             $best_length = 0;
             foreach ($map[$code] as $val) { // Explore all candidates.
               list($file, $orig_line) = $val;
               $length = 1;
               // Search also backwards for short lines.
               foreach (array(-1, 1) as $direction) {
                 $offset = $direction;
                 while (!isset($copies[$line + $offset]) &&
                     isset($added[$line + $offset]) &&
                     idx($files[$file], $orig_line + $offset) ===
                       $added[$line + $offset]) {
                   $length++;
                   $offset += $direction;
                 }
               }
               if ($length > $best_length ||
                   ($length == $best_length && // Prefer moves.
                    idx($types[$file], $orig_line) == '-')) {
                 $best_length = $length;
                 // ($offset - 1) contains number of forward matching lines.
                 $best_offset = $offset - 1;
                 $best_file = $file;
                 $best_line = $orig_line;
               }
             }
             $file = ($best_file == $changeset->getFilename() ? '' : $best_file);
             for ($i = $best_length; $i--; ) {
               $type = idx($types[$best_file], $best_line + $best_offset - $i);
               $copies[$line + $best_offset - $i] = ($best_length < $min_lines
                 ? array() // Ignore short blocks.
                 : array($file, $best_line + $best_offset - $i, $type));
             }
             for ($i = 0; $i < $best_offset; $i++) {
               next($added);
             }
           }
         }
       }
       $copies = array_filter($copies);
       if ($copies) {
         $metadata = $changeset->getMetadata();
         $metadata['copy:lines'] = $copies;
         $changeset->setMetadata($metadata);
       }
     }
     return $changesets;
   }
 
 }
diff --git a/src/applications/differential/view/DifferentialChangesetDetailView.php b/src/applications/differential/view/DifferentialChangesetDetailView.php
index 7723a7be7d..a6dc8a5f3a 100644
--- a/src/applications/differential/view/DifferentialChangesetDetailView.php
+++ b/src/applications/differential/view/DifferentialChangesetDetailView.php
@@ -1,244 +1,255 @@
 <?php
 
 final class DifferentialChangesetDetailView extends AphrontView {
 
   private $changeset;
   private $buttons = array();
   private $editable;
   private $symbolIndex;
   private $id;
   private $vsChangesetID;
   private $renderURI;
   private $whitespace;
   private $renderingRef;
   private $autoload;
+  private $loaded;
   private $renderer;
 
   public function setAutoload($autoload) {
     $this->autoload = $autoload;
     return $this;
   }
 
   public function getAutoload() {
     return $this->autoload;
   }
 
+  public function setLoaded($loaded) {
+    $this->loaded = $loaded;
+    return $this;
+  }
+
+  public function getLoaded() {
+    return $this->loaded;
+  }
+
   public function setRenderingRef($rendering_ref) {
     $this->renderingRef = $rendering_ref;
     return $this;
   }
 
   public function getRenderingRef() {
     return $this->renderingRef;
   }
 
   public function setWhitespace($whitespace) {
     $this->whitespace = $whitespace;
     return $this;
   }
 
   public function getWhitespace() {
     return $this->whitespace;
   }
 
   public function setRenderURI($render_uri) {
     $this->renderURI = $render_uri;
     return $this;
   }
 
   public function getRenderURI() {
     return $this->renderURI;
   }
 
   public function setChangeset($changeset) {
     $this->changeset = $changeset;
     return $this;
   }
 
   public function addButton($button) {
     $this->buttons[] = $button;
     return $this;
   }
 
   public function setEditable($editable) {
     $this->editable = $editable;
     return $this;
   }
 
   public function setSymbolIndex($symbol_index) {
     $this->symbolIndex = $symbol_index;
     return $this;
   }
 
   public function setRenderer($renderer) {
     $this->renderer = $renderer;
     return $this;
   }
 
   public function getRenderer() {
     return $this->renderer;
   }
 
   public function getID() {
     if (!$this->id) {
       $this->id = celerity_generate_unique_node_id();
     }
     return $this->id;
   }
 
   public function setID($id) {
     $this->id = $id;
     return $this;
   }
 
   public function setVsChangesetID($vs_changeset_id) {
     $this->vsChangesetID = $vs_changeset_id;
     return $this;
   }
 
   public function getVsChangesetID() {
     return $this->vsChangesetID;
   }
 
   public function getFileIcon($filename) {
     $path_info = pathinfo($filename);
     $extension = idx($path_info, 'extension');
     switch ($extension) {
       case 'psd':
       case 'ai':
         $icon = 'fa-eye';
         break;
       case 'conf':
         $icon = 'fa-wrench';
         break;
       case 'wav':
       case 'mp3':
       case 'aiff':
         $icon = 'fa-file-sound-o';
         break;
       case 'm4v':
       case 'mov':
         $icon = 'fa-file-movie-o';
         break;
       case 'sql':
       case 'db':
         $icon = 'fa-database';
         break;
       case 'xls':
       case 'csv':
         $icon = 'fa-file-excel-o';
         break;
       case 'ics':
         $icon = 'fa-calendar';
         break;
       case 'zip':
       case 'tar':
       case 'bz':
       case 'tgz':
       case 'gz':
         $icon = 'fa-file-archive-o';
         break;
       case 'png':
       case 'jpg':
       case 'bmp':
       case 'gif':
         $icon = 'fa-file-picture-o';
         break;
       case 'txt':
         $icon = 'fa-file-text-o';
         break;
       case 'doc':
       case 'docx':
         $icon = 'fa-file-word-o';
         break;
       case 'pdf':
         $icon = 'fa-file-pdf-o';
         break;
       default:
         $icon = 'fa-file-code-o';
         break;
     }
     return $icon;
   }
 
   public function render() {
     $this->requireResource('differential-changeset-view-css');
     $this->requireResource('syntax-highlighting-css');
 
     Javelin::initBehavior('phabricator-oncopy', array());
 
     $changeset = $this->changeset;
     $class = 'differential-changeset';
     if (!$this->editable) {
       $class .= ' differential-changeset-immutable';
     }
 
     $buttons = null;
     if ($this->buttons) {
       $buttons = phutil_tag(
         'div',
         array(
           'class' => 'differential-changeset-buttons',
         ),
         $this->buttons);
     }
 
     $id = $this->getID();
 
     if ($this->symbolIndex) {
       Javelin::initBehavior(
         'repository-crossreference',
         array(
           'container' => $id,
         ) + $this->symbolIndex);
     }
 
     $display_filename = $changeset->getDisplayFilename();
     $display_icon = $this->getFileIcon($display_filename);
     $icon = id(new PHUIIconView())
       ->setIconFont($display_icon);
 
     return javelin_tag(
       'div',
       array(
         'sigil' => 'differential-changeset',
         'meta'  => array(
           'left'  => nonempty(
             $this->getVsChangesetID(),
             $this->changeset->getID()),
           'right' => $this->changeset->getID(),
           'renderURI' => $this->getRenderURI(),
           'whitespace' => $this->getWhitespace(),
           'highlight' => null,
           'renderer' => $this->getRenderer(),
           'ref' => $this->getRenderingRef(),
           'autoload' => $this->getAutoload(),
+          'loaded' => $this->getLoaded(),
         ),
         'class' => $class,
         'id'    => $id,
       ),
       array(
         id(new PhabricatorAnchorView())
           ->setAnchorName($changeset->getAnchorName())
           ->setNavigationMarker(true)
           ->render(),
         $buttons,
         phutil_tag('h1',
           array(
             'class' => 'differential-file-icon-header',
           ),
           array(
             $icon,
             $display_filename,
           )),
         javelin_tag(
           'div',
           array(
             'class' => 'changeset-view-content',
             'sigil' => 'changeset-view-content',
           ),
           $this->renderChildren()),
       ));
   }
 
 }
diff --git a/src/applications/differential/view/DifferentialChangesetListView.php b/src/applications/differential/view/DifferentialChangesetListView.php
index 077cf688ca..d965156a85 100644
--- a/src/applications/differential/view/DifferentialChangesetListView.php
+++ b/src/applications/differential/view/DifferentialChangesetListView.php
@@ -1,361 +1,379 @@
 <?php
 
 final class DifferentialChangesetListView extends AphrontView {
 
   private $changesets = array();
   private $visibleChangesets = array();
   private $references = array();
   private $inlineURI;
   private $renderURI = '/differential/changeset/';
   private $whitespace;
 
   private $standaloneURI;
   private $leftRawFileURI;
   private $rightRawFileURI;
 
   private $symbolIndexes = array();
   private $repository;
   private $branch;
   private $diff;
   private $vsMap = array();
 
   private $title;
+  private $parser;
+
+  public function setParser(DifferentialChangesetParser $parser) {
+    $this->parser = $parser;
+    return $this;
+  }
+
+  public function getParser() {
+    return $this->parser;
+  }
 
   public function setTitle($title) {
     $this->title = $title;
     return $this;
   }
   private function getTitle() {
     return $this->title;
   }
 
   public function setBranch($branch) {
     $this->branch = $branch;
     return $this;
   }
   private function getBranch() {
     return $this->branch;
   }
 
   public function setChangesets($changesets) {
     $this->changesets = $changesets;
     return $this;
   }
 
   public function setVisibleChangesets($visible_changesets) {
     $this->visibleChangesets = $visible_changesets;
     return $this;
   }
 
   public function setInlineCommentControllerURI($uri) {
     $this->inlineURI = $uri;
     return $this;
   }
 
   public function setRepository(PhabricatorRepository $repository) {
     $this->repository = $repository;
     return $this;
   }
 
   public function setDiff(DifferentialDiff $diff) {
     $this->diff = $diff;
     return $this;
   }
 
   public function setRenderingReferences(array $references) {
     $this->references = $references;
     return $this;
   }
 
   public function setSymbolIndexes(array $indexes) {
     $this->symbolIndexes = $indexes;
     return $this;
   }
 
   public function setRenderURI($render_uri) {
     $this->renderURI = $render_uri;
     return $this;
   }
 
   public function setWhitespace($whitespace) {
     $this->whitespace = $whitespace;
     return $this;
   }
 
   public function setVsMap(array $vs_map) {
     $this->vsMap = $vs_map;
     return $this;
   }
 
   public function getVsMap() {
     return $this->vsMap;
   }
 
   public function setStandaloneURI($uri) {
     $this->standaloneURI = $uri;
     return $this;
   }
 
   public function setRawFileURIs($l, $r) {
     $this->leftRawFileURI = $l;
     $this->rightRawFileURI = $r;
     return $this;
   }
 
   public function render() {
     $this->requireResource('differential-changeset-view-css');
 
     $changesets = $this->changesets;
 
     Javelin::initBehavior('differential-toggle-files', array(
       'pht' => array(
         'undo' => pht('Undo'),
         'collapsed' => pht('This file content has been collapsed.'),
       ),
     ));
     Javelin::initBehavior(
       'differential-dropdown-menus',
       array(
         'pht' => array(
           'Open in Editor' => pht('Open in Editor'),
           'Show Entire File' => pht('Show Entire File'),
           'Entire File Shown' => pht('Entire File Shown'),
           "Can't Toggle Unloaded File" => pht("Can't Toggle Unloaded File"),
           'Expand File' => pht('Expand File'),
           'Collapse File' => pht('Collapse File'),
           'Browse in Diffusion' => pht('Browse in Diffusion'),
           'View Standalone' => pht('View Standalone'),
           'Show Raw File (Left)' => pht('Show Raw File (Left)'),
           'Show Raw File (Right)' => pht('Show Raw File (Right)'),
           'Configure Editor' => pht('Configure Editor'),
           'Load Changes' => pht('Load Changes'),
           'View Side-by-Side' => pht('View Side-by-Side'),
           'View Unified' => pht('View Unified'),
           'Change Text Encoding...' => pht('Change Text Encoding...'),
           'Highlight As...' => pht('Highlight As...'),
         ),
       ));
 
     $renderer = DifferentialChangesetParser::getDefaultRendererForViewer(
       $this->getUser());
 
     $output = array();
     $ids = array();
     foreach ($changesets as $key => $changeset) {
 
       $file = $changeset->getFilename();
       $class = 'differential-changeset';
       if (!$this->inlineURI) {
         $class .= ' differential-changeset-noneditable';
       }
 
       $ref = $this->references[$key];
 
       $detail = id(new DifferentialChangesetDetailView())
         ->setUser($this->getUser());
 
       $uniq_id = 'diff-'.$changeset->getAnchorName();
       $detail->setID($uniq_id);
 
       $view_options = $this->renderViewOptionsDropdown(
         $detail,
         $ref,
         $changeset);
 
       $detail->setChangeset($changeset);
       $detail->addButton($view_options);
       $detail->setSymbolIndex(idx($this->symbolIndexes, $key));
       $detail->setVsChangesetID(idx($this->vsMap, $changeset->getID()));
       $detail->setEditable(true);
       $detail->setRenderingRef($ref);
-      $detail->setAutoload(isset($this->visibleChangesets[$key]));
 
       $detail->setRenderURI($this->renderURI);
       $detail->setWhitespace($this->whitespace);
       $detail->setRenderer($renderer);
 
-      if (isset($this->visibleChangesets[$key])) {
-        $load = 'Loading...';
+      if ($this->getParser()) {
+        $detail->appendChild($this->getParser()->renderChangeset());
+        $detail->setLoaded(true);
       } else {
-        $load = javelin_tag(
-          'a',
-          array(
-            'class' => 'button grey',
-            'href' => '#'.$uniq_id,
-            'sigil' => 'differential-load',
-            'meta' => array(
-              'id' => $detail->getID(),
-              'kill' => true,
+        $detail->setAutoload(isset($this->visibleChangesets[$key]));
+        if (isset($this->visibleChangesets[$key])) {
+          $load = 'Loading...';
+        } else {
+          $load = javelin_tag(
+            'a',
+            array(
+              'class' => 'button grey',
+              'href' => '#'.$uniq_id,
+              'sigil' => 'differential-load',
+              'meta' => array(
+                'id' => $detail->getID(),
+                'kill' => true,
+              ),
+              'mustcapture' => true,
+            ),
+            pht('Load File'));
+        }
+        $detail->appendChild(
+          phutil_tag(
+            'div',
+            array(
+              'id' => $uniq_id,
             ),
-            'mustcapture' => true,
-          ),
-          pht('Load File'));
+            phutil_tag(
+              'div',
+              array('class' => 'differential-loading'),
+              $load)));
       }
-      $detail->appendChild(
-        phutil_tag(
-          'div',
-          array(
-            'id' => $uniq_id,
-          ),
-          phutil_tag('div', array('class' => 'differential-loading'), $load)));
-      $output[] = $detail->render();
 
+      $output[] = $detail->render();
       $ids[] = $detail->getID();
     }
 
     $this->requireResource('aphront-tooltip-css');
 
     $this->initBehavior('differential-populate', array(
       'changesetViewIDs' => $ids,
     ));
 
     $this->initBehavior('differential-comment-jump', array());
 
     if ($this->inlineURI) {
       $undo_templates = $this->renderUndoTemplates();
 
       Javelin::initBehavior('differential-edit-inline-comments', array(
         'uri'             => $this->inlineURI,
         'undo_templates'  => $undo_templates,
         'stage'           => 'differential-review-stage',
       ));
     }
 
     $header = id(new PHUIHeaderView())
       ->setHeader($this->getTitle());
 
     $content = phutil_tag(
       'div',
       array(
         'class' => 'differential-review-stage',
         'id'    => 'differential-review-stage',
       ),
       $output);
 
     $object_box = id(new PHUIObjectBoxView())
       ->setHeader($header)
       ->appendChild($content);
 
     return $object_box;
   }
 
   /**
    * Render the "Undo" markup for the inline comment undo feature.
    */
   private function renderUndoTemplates() {
     $link = javelin_tag(
       'a',
       array(
         'href'  => '#',
         'sigil' => 'differential-inline-comment-undo',
       ),
       pht('Undo'));
 
     $div = phutil_tag(
       'div',
       array(
         'class' => 'differential-inline-undo',
       ),
       array('Changes discarded. ', $link));
 
     return array(
       'l' => phutil_tag('table', array(),
         phutil_tag('tr', array(), array(
           phutil_tag('th', array()),
           phutil_tag('td', array(), $div),
           phutil_tag('th', array()),
           phutil_tag('td', array('colspan' => 3)),
         ))),
 
       'r' => phutil_tag('table', array(),
         phutil_tag('tr', array(), array(
           phutil_tag('th', array()),
           phutil_tag('td', array()),
           phutil_tag('th', array()),
           phutil_tag('td', array('colspan' => 3), $div),
         ))),
     );
   }
 
   private function renderViewOptionsDropdown(
     DifferentialChangesetDetailView $detail,
     $ref,
     DifferentialChangeset $changeset) {
 
     $meta = array();
 
     $qparams = array(
       'ref'         => $ref,
       'whitespace'  => $this->whitespace,
     );
 
     if ($this->standaloneURI) {
       $uri = new PhutilURI($this->standaloneURI);
       $uri->setQueryParams($uri->getQueryParams() + $qparams);
       $meta['standaloneURI'] = (string)$uri;
     }
 
     $repository = $this->repository;
     if ($repository) {
       try {
         $meta['diffusionURI'] =
           (string)$repository->getDiffusionBrowseURIForPath(
             $this->user,
             $changeset->getAbsoluteRepositoryPath($repository, $this->diff),
             idx($changeset->getMetadata(), 'line:first'),
             $this->getBranch());
       } catch (DiffusionSetupException $e) {
         // Ignore
       }
     }
 
     $change = $changeset->getChangeType();
 
     if ($this->leftRawFileURI) {
       if ($change != DifferentialChangeType::TYPE_ADD) {
         $uri = new PhutilURI($this->leftRawFileURI);
         $uri->setQueryParams($uri->getQueryParams() + $qparams);
         $meta['leftURI'] = (string)$uri;
       }
     }
 
     if ($this->rightRawFileURI) {
       if ($change != DifferentialChangeType::TYPE_DELETE &&
           $change != DifferentialChangeType::TYPE_MULTICOPY) {
         $uri = new PhutilURI($this->rightRawFileURI);
         $uri->setQueryParams($uri->getQueryParams() + $qparams);
         $meta['rightURI'] = (string)$uri;
       }
     }
 
     $user = $this->user;
     if ($user && $repository) {
       $path = ltrim(
         $changeset->getAbsoluteRepositoryPath($repository, $this->diff),
         '/');
       $line = idx($changeset->getMetadata(), 'line:first', 1);
       $callsign = $repository->getCallsign();
       $editor_link = $user->loadEditorLink($path, $line, $callsign);
       if ($editor_link) {
         $meta['editor'] = $editor_link;
       } else {
         $meta['editorConfigure'] = '/settings/panel/display/';
       }
     }
 
     $meta['containerID'] = $detail->getID();
     $caret = phutil_tag('span', array('class' => 'caret'), '');
 
     return javelin_tag(
       'a',
       array(
         'class'   => 'button grey small dropdown',
         'meta'    => $meta,
         'href'    => idx($meta, 'detailURI', '#'),
         'target'  => '_blank',
         'sigil'   => 'differential-view-options',
       ),
       array(pht('View Options'), $caret));
   }
 
 }
diff --git a/webroot/rsrc/js/application/differential/ChangesetViewManager.js b/webroot/rsrc/js/application/differential/ChangesetViewManager.js
index 36f097cf49..f80883f910 100644
--- a/webroot/rsrc/js/application/differential/ChangesetViewManager.js
+++ b/webroot/rsrc/js/application/differential/ChangesetViewManager.js
@@ -1,365 +1,366 @@
 /**
  * @provides changeset-view-manager
  * @requires javelin-dom
  *           javelin-util
  *           javelin-stratcom
  *           javelin-install
  *           javelin-workflow
  *           javelin-router
  *           javelin-behavior-device
  *           javelin-vector
  */
 
 
 JX.install('ChangesetViewManager', {
 
   construct : function(node) {
     this._node = node;
 
     var data = this._getNodeData();
     this._renderURI = data.renderURI;
     this._ref = data.ref;
     this._whitespace = data.whitespace;
     this._renderer = data.renderer;
     this._highlight = data.highlight;
     this._encoding = data.encoding;
+    this._loaded = data.loaded;
   },
 
   members: {
     _node: null,
     _loaded: false,
     _sequence: 0,
     _stabilize: false,
 
     _renderURI: null,
     _ref: null,
     _whitespace: null,
     _renderer: null,
     _highlight: null,
     _encoding: null,
 
 
     /**
      * Has the content of this changeset been loaded?
      *
      * This method returns `true` if a request has been fired, even if the
      * response has not returned yet.
      *
      * @return bool True if the content has been loaded.
      */
     isLoaded: function() {
       return this._loaded;
     },
 
 
     /**
      * Configure stabilization of the document position on content load.
      *
      * When we dump the changeset into the document, we can try to stabilize
      * the document scroll position so that the user doesn't feel like they
      * are jumping around as things load in. This is generally useful when
      * populating initial changes.
      *
      * However, if a user explicitly requests a content load by clicking a
      * "Load" link or using the dropdown menu, this stabilization generally
      * feels unnatural, so we don't use it in response to explicit user action.
      *
      * @param bool  True to stabilize the next content fill.
      * @return this
      */
     setStabilize: function(stabilize) {
       this._stabilize = stabilize;
       return this;
     },
 
 
     /**
      * Should this changeset load immediately when the page loads?
      *
      * Normally, changes load immediately, but if a diff or commit is very
      * large we stop doing this and have the user load files explicitly, or
      * choose to load everything.
      *
      * @return bool True if the changeset should load automatically when the
      *   page loads.
      */
     shouldAutoload: function() {
       return this._getNodeData().autoload;
     },
 
 
     /**
      * Load this changeset, if it isn't already loading.
      *
      * This fires a request to fill the content of this changeset, provided
      * there isn't already a request in flight. To force a reload, use
      * @{method:reload}.
      *
      * @return this
      */
     load: function() {
       if (this._loaded) {
         return this;
       }
 
       return this.reload();
     },
 
 
     /**
      * Reload the changeset content.
      *
      * This method always issues a request, even if the content is already
      * loading. To load conditionally, use @{method:load}.
      *
      * @return this
      */
     reload: function() {
       this._loaded = true;
       this._sequence++;
 
       var params = this._getViewParameters();
 
       var workflow = new JX.Workflow(this._renderURI, params)
         .setHandler(JX.bind(this, this._onresponse, this._sequence));
 
       this._startContentWorkflow(workflow);
 
       JX.DOM.setContent(
         this._getContentFrame(),
         JX.$N(
           'div',
           {className: 'differential-loading'},
           'Loading...'));
 
       return this;
     },
 
     /**
      * Load missing context in a changeset.
      *
      * We do this when the user clicks "Show X Lines". We also expand all of
      * the missing context when they "Show Entire File".
      *
      * @param string Line range specification, like "0-40/0-20".
      * @param node Row where the context should be rendered after loading.
      * @param bool True if this is a bulk load of multiple context blocks.
      * @return this
      */
     loadContext: function(range, target, bulk) {
       var params = this._getViewParameters();
       params.range = range;
 
       var container = JX.DOM.scry(target, 'td')[0];
       // TODO: pht()
       JX.DOM.setContent(container, 'Loading...');
       JX.DOM.alterClass(target, 'differential-show-more-loading', true);
 
       var workflow = new JX.Workflow(this._renderURI, params)
         .setHandler(JX.bind(this, this._oncontext, target));
 
       if (bulk) {
         // If we're loading a bunch of these because the viewer clicked
         // "Show Entire File Content" or similar, use lower-priority requests
         // and draw a progress bar.
         this._startContentWorkflow(workflow);
       } else {
         // If this is a single click on a context link, use a higher priority
         // load without a chrome change.
         workflow.start();
       }
 
       return this;
     },
 
     _startContentWorkflow: function(workflow) {
       var routable = workflow.getRoutable();
 
       routable
         .setPriority(500)
         .setType('content')
         .setKey(this._getRoutableKey());
 
       JX.Router.getInstance().queue(routable);
     },
 
 
     /**
      * Receive a response to a context request.
      */
     _oncontext: function(target, response) {
       var table = JX.$H(response.changeset).getNode();
       var root = target.parentNode;
       this._moveRows(table, root, target);
       root.removeChild(target);
     },
 
     _moveRows: function(src, dst, before) {
       var rows = JX.DOM.scry(src, 'tr');
       for (var ii = 0; ii < rows.length; ii++) {
 
         // Find the table this <tr /> belongs to. If it's a sub-table, like a
         // table in an inline comment, don't copy it.
         if (JX.DOM.findAbove(rows[ii], 'table') !== src) {
           continue;
         }
 
         if (before) {
           dst.insertBefore(rows[ii], before);
         } else {
           dst.appendChild(rows[ii]);
         }
       }
     },
 
     /**
      * Get parameters which define the current rendering options.
      */
     _getViewParameters: function() {
       return {
         ref: this._ref,
         whitespace: this._whitespace || '',
         renderer: this.getRenderer() || '',
         highlight: this._highlight || '',
         encoding: this._encoding || ''
       };
     },
 
     /**
      * Get the active @{class:JX.Routable} for this changeset.
      *
      * After issuing a request with @{method:load} or @{method:reload}, you
      * can adjust routable settings (like priority) by querying the routable
      * with this method. Note that there may not be a current routable.
      *
      * @return JX.Routable|null Active routable, if one exists.
      */
     getRoutable: function() {
       return JX.Router.getInstance().getRoutableByKey(this._getRoutableKey());
     },
 
     setRenderer: function(renderer) {
       this._renderer = renderer;
       return this;
     },
 
     getRenderer: function() {
       if (this._renderer !== null) {
         return this._renderer;
       }
 
       // NOTE: If you load the page at one device resolution and then resize to
       // a different one we don't re-render the diffs, because it's a
       // complicated mess and you could lose inline comments, cursor positions,
       // etc.
       return (JX.Device.getDevice() == 'desktop') ? '2up' : '1up';
     },
 
     setEncoding: function(encoding) {
       this._encoding = encoding;
       return this;
     },
 
     getEncoding: function() {
       return this._encoding;
     },
 
     setHighlight: function(highlight) {
       this._highlight = highlight;
       return this;
     },
 
     getHighlight: function() {
       return this._highlight;
     },
 
     _getNodeData: function() {
       return JX.Stratcom.getData(this._node);
     },
 
 
     _onresponse: function(sequence, response) {
       if (sequence != this._sequence) {
         // If this isn't the most recent request, ignore it. This normally
         // means the user changed view settings between the time the page loaded
         // and the content filled.
         return;
       }
 
       // As we populate the changeset list, we try to hold the document scroll
       // position steady, so that, e.g., users who want to leave a comment on a
       // diff with a large number of changes don't constantly have the text
       // area scrolled off the bottom of the screen until the entire diff loads.
       //
       // There are two three major cases here:
       //
       //  - If we're near the top of the document, never scroll.
       //  - If we're near the bottom of the document, always scroll.
       //  - Otherwise, scroll if the changes were above the midline of the
       //    viewport.
 
       var target = this._node;
 
       var old_pos = JX.Vector.getScroll();
       var old_view = JX.Vector.getViewport();
       var old_dim = JX.Vector.getDocument();
 
       // Number of pixels away from the top or bottom of the document which
       // count as "nearby".
       var sticky = 480;
 
       var near_top = (old_pos.y <= sticky);
       var near_bot = ((old_pos.y + old_view.y) >= (old_dim.y - sticky));
 
       var target_pos = JX.Vector.getPos(target);
       var target_dim = JX.Vector.getDim(target);
       var target_mid = (target_pos.y + (target_dim.y / 2));
 
       var view_mid = (old_pos.y + (old_view.y / 2));
       var above_mid = (target_mid < view_mid);
 
       var frame = this._getContentFrame();
       JX.DOM.setContent(frame, JX.$H(response.changeset));
 
       if (this._stabilize) {
         if (!near_top) {
           if (near_bot || above_mid) {
             // Figure out how much taller the document got.
             var delta = (JX.Vector.getDocument().y - old_dim.y);
             JX.DOM.scrollToPosition(old_pos.x, old_pos.y + delta);
           }
         }
         this._stabilize = false;
       }
 
       if (response.coverage) {
         for (var k in response.coverage) {
           try {
             JX.DOM.replace(JX.$(k), JX.$H(response.coverage[k]));
           } catch (ignored) {
             // Not terribly important.
           }
         }
       }
     },
 
     _getContentFrame: function() {
       return JX.DOM.find(this._node, 'div', 'changeset-view-content');
     },
 
     _getRoutableKey: function() {
       return 'changeset-view.' + this._ref + '.' + this._sequence;
     }
 
   },
 
   statics: {
     getForNode: function(node) {
       var data = JX.Stratcom.getData(node);
       if (!data.changesetViewManager) {
         data.changesetViewManager = new JX.ChangesetViewManager(node);
       }
       return data.changesetViewManager;
     }
   }
 });