diff --git a/resources/celerity/map.php b/resources/celerity/map.php
--- a/resources/celerity/map.php
+++ b/resources/celerity/map.php
@@ -11,7 +11,7 @@
     'core.pkg.js' => '5a1c336d',
     'darkconsole.pkg.js' => '8ab24e01',
     'differential.pkg.css' => '5f5d3a4c',
-    'differential.pkg.js' => '58dae818',
+    'differential.pkg.js' => '6b52883b',
     'diffusion.pkg.css' => '591664fa',
     'diffusion.pkg.js' => 'bfc0737b',
     'maniphest.pkg.css' => '68d4dd3d',
@@ -367,7 +367,7 @@
     'rsrc/js/application/differential/behavior-comment-preview.js' => '6932def3',
     'rsrc/js/application/differential/behavior-diff-radios.js' => 'e1ff79b1',
     'rsrc/js/application/differential/behavior-dropdown-menus.js' => '2035b9cb',
-    'rsrc/js/application/differential/behavior-edit-inline-comments.js' => '334267b3',
+    'rsrc/js/application/differential/behavior-edit-inline-comments.js' => '1360cac8',
     'rsrc/js/application/differential/behavior-keyboard-nav.js' => '2c426492',
     'rsrc/js/application/differential/behavior-populate.js' => '8694b1df',
     'rsrc/js/application/differential/behavior-show-field-details.js' => 'bba9eedf',
@@ -569,7 +569,7 @@
     'javelin-behavior-differential-comment-jump' => '4fdb476d',
     'javelin-behavior-differential-diff-radios' => 'e1ff79b1',
     'javelin-behavior-differential-dropdown-menus' => '2035b9cb',
-    'javelin-behavior-differential-edit-inline-comments' => '334267b3',
+    'javelin-behavior-differential-edit-inline-comments' => '1360cac8',
     'javelin-behavior-differential-feedback-preview' => '6932def3',
     'javelin-behavior-differential-keyboard-navigation' => '2c426492',
     'javelin-behavior-differential-populate' => '8694b1df',
@@ -889,6 +889,14 @@
       'javelin-install',
       'javelin-util',
     ),
+    '1360cac8' => array(
+      'javelin-behavior',
+      'javelin-stratcom',
+      'javelin-dom',
+      'javelin-util',
+      'javelin-vector',
+      'differential-inline-comment-editor',
+    ),
     '13c739ea' => array(
       'javelin-behavior',
       'javelin-stratcom',
@@ -1027,14 +1035,6 @@
     '331b1611' => array(
       'javelin-install',
     ),
-    '334267b3' => array(
-      'javelin-behavior',
-      'javelin-stratcom',
-      'javelin-dom',
-      'javelin-util',
-      'javelin-vector',
-      'differential-inline-comment-editor',
-    ),
     '3ab51e2c' => array(
       'javelin-behavior',
       'javelin-behavior-device',
diff --git a/src/infrastructure/diff/PhabricatorInlineCommentController.php b/src/infrastructure/diff/PhabricatorInlineCommentController.php
--- a/src/infrastructure/diff/PhabricatorInlineCommentController.php
+++ b/src/infrastructure/diff/PhabricatorInlineCommentController.php
@@ -201,6 +201,7 @@
       ->setUser($user)
       ->setSubmitURI($request->getRequestURI())
       ->setOnRight($this->getIsOnRight())
+      ->setIsNewFile($this->getIsNewFile())
       ->setNumber($this->getLineNumber())
       ->setLength($this->getLineLength())
       ->setRenderer($this->getRenderer());
diff --git a/src/infrastructure/diff/view/PHUIDiffInlineCommentDetailView.php b/src/infrastructure/diff/view/PHUIDiffInlineCommentDetailView.php
--- a/src/infrastructure/diff/view/PHUIDiffInlineCommentDetailView.php
+++ b/src/infrastructure/diff/view/PHUIDiffInlineCommentDetailView.php
@@ -78,6 +78,7 @@
       'id' => $inline->getID(),
       'number' => $inline->getLineNumber(),
       'length' => $inline->getLineLength(),
+      'isNewFile' => (bool)$inline->getIsNewFile(),
       'on_right' => $this->onRight,
       'original' => $inline->getContent(),
     );
diff --git a/src/infrastructure/diff/view/PHUIDiffInlineCommentEditView.php b/src/infrastructure/diff/view/PHUIDiffInlineCommentEditView.php
--- a/src/infrastructure/diff/view/PHUIDiffInlineCommentEditView.php
+++ b/src/infrastructure/diff/view/PHUIDiffInlineCommentEditView.php
@@ -10,6 +10,16 @@
   private $number;
   private $length;
   private $renderer;
+  private $isNewFile;
+
+  public function setIsNewFile($is_new_file) {
+    $this->isNewFile = $is_new_file;
+    return $this;
+  }
+
+  public function getIsNewFile() {
+    return $this->isNewFile;
+  }
 
   public function getIsOnRight() {
     return $this->onRight;
@@ -160,7 +170,8 @@
         'class' => 'differential-inline-comment-edit',
         'sigil' => 'differential-inline-comment',
         'meta' => array(
-          'on_right' => $this->onRight,
+          'on_right' => $this->getIsOnRight(),
+          'isNewFile' => (bool)$this->getIsNewFile(),
           'number' => $this->number,
           'length' => $this->length,
         ),
diff --git a/webroot/rsrc/js/application/differential/behavior-edit-inline-comments.js b/webroot/rsrc/js/application/differential/behavior-edit-inline-comments.js
--- a/webroot/rsrc/js/application/differential/behavior-edit-inline-comments.js
+++ b/webroot/rsrc/js/application/differential/behavior-edit-inline-comments.js
@@ -269,20 +269,11 @@
       } else {
         root = e.getNode('differential-changeset');
         if (root) {
-
           var data = e.getNodeData('differential-inline-comment');
           var change = e.getNodeData('differential-changeset');
 
-          var id_part  = data.on_right ? change.right : change.left;
-
-          // NOTE: We can't just look for 'tag:td' because the event might be
-          // inside a table which is inside an inline comment.
-          var comment = e.getNode('differential-inline-comment');
-          var td = JX.DOM.findAbove(comment, 'td');
-          var th = td.previousSibling;
-
-          // TODO: For one-up views, this is incorrect!
-          var new_part = isNewFile(th) ? 'N' : 'O';
+          var id_part = data.on_right ? change.right : change.left;
+          var new_part = data.isNewFile ? 'N' : 'O';
           var prefix = 'C' + id_part + new_part + 'L';
 
           origin = JX.$(prefix + data.number);