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diff --git a/src/applications/differential/parser/DifferentialChangesetParser.php b/src/applications/differential/parser/DifferentialChangesetParser.php
--- a/src/applications/differential/parser/DifferentialChangesetParser.php
+++ b/src/applications/differential/parser/DifferentialChangesetParser.php
@@ -933,12 +933,50 @@
$feedback_mask = array();
if ($this->comments) {
+ // If there are any comments which appear in sections of the file which
+ // we don't have, we're going to move them backwards to the closest
+ // earlier line. Two cases where this may happen are:
+ //
+ // - Porting ghost comments forward into a file which was mostly
+ // deleted.
+ // - Porting ghost comments forward from a full-context diff to a
+ // partial-context diff.
+
+ list($old_backmap, $new_backmap) = $this->buildLineBackmaps();
+
foreach ($this->comments as $comment) {
+ $new_side = $this->isCommentOnRightSideWhenDisplayed($comment);
+
+ $line = $comment->getLineNumber();
+ if ($new_side) {
+ $back_line = $new_backmap[$line];
+ } else {
+ $back_line = $old_backmap[$line];
+ }
+
+ if ($back_line != $line) {
+ // TODO: This should probably be cleaner, but just be simple and
+ // obvious for now.
+ $ghost = $comment->getIsGhost();
+ if ($ghost) {
+ $moved = pht(
+ 'This comment originally appeared on line %s, but that line '.
+ 'does not exist in this version of the diff. It has been '.
+ 'moved backward to the nearest line.',
+ new PhutilNumber($line));
+ $ghost['reason'] = $ghost['reason']."\n\n".$moved;
+ $comment->setIsGhost($ghost);
+ }
+
+ $comment->setLineNumber($back_line);
+ $comment->setLineLength(0);
+
+ }
+
$start = max($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;
@@ -959,6 +997,7 @@
$feedback_mask[$ii] = true;
}
}
+
$this->comments = msort($this->comments, 'getID');
foreach ($this->comments as $comment) {
$final = $comment->getLineNumber() +
@@ -1483,4 +1522,48 @@
return $changesets;
}
+ /**
+ * Build maps from lines comments appear on to actual lines.
+ */
+ private function buildLineBackmaps() {
+ $old_back = array();
+ $new_back = array();
+ foreach ($this->old as $ii => $old) {
+ $old_back[$old['line']] = $old['line'];
+ }
+ foreach ($this->new as $ii => $new) {
+ $new_back[$new['line']] = $new['line'];
+ }
+
+ $max_old_line = 0;
+ $max_new_line = 0;
+ foreach ($this->comments as $comment) {
+ if ($this->isCommentOnRightSideWhenDisplayed($comment)) {
+ $max_new_line = max($max_new_line, $comment->getLineNumber());
+ } else {
+ $max_old_line = max($max_old_line, $comment->getLineNumber());
+ }
+ }
+
+ $cursor = 1;
+ for ($ii = 1; $ii <= $max_old_line; $ii++) {
+ if (empty($old_back[$ii])) {
+ $old_back[$ii] = $cursor;
+ } else {
+ $cursor = $old_back[$ii];
+ }
+ }
+
+ $cursor = 1;
+ for ($ii = 1; $ii <= $max_new_line; $ii++) {
+ if (empty($new_back[$ii])) {
+ $new_back[$ii] = $cursor;
+ } else {
+ $cursor = $new_back[$ii];
+ }
+ }
+
+ return array($old_back, $new_back);
+ }
+
}

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