dsmiley commented on a change in pull request #1123: LUCENE-9093: Unified 
highlighter with word separator never gives context to the left
URL: https://github.com/apache/lucene-solr/pull/1123#discussion_r361828618
 
 

 ##########
 File path: 
lucene/highlighter/src/java/org/apache/lucene/search/uhighlight/LengthGoalBreakIterator.java
 ##########
 @@ -173,8 +205,30 @@ private int moveToBreak(int idx) { // precondition: idx 
is a known break
 
   // called at start of new Passage given first word start offset
   @Override
-  public int preceding(int offset) {
-    return baseIter.preceding(offset); // no change needed
+  public int preceding(int matchStartIndex) {
+    final int targetIdx = (matchStartIndex - 1) - (int)(lengthGoal * 
fragmentAlignment);
+    if (targetIdx <= 0) {
+      return 0;
+    }
+    final int beforeIdx = baseIter.preceding(targetIdx + 1);
+    if (beforeIdx == DONE) {
+      return 0;
 
 Review comment:
   Returning beforeIdx (DONE) is perhaps more accurate/correct than 0?  Or 
maybe first()?  Perhaps doesn't matter; this is perhaps theoretical.

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