Fixed the deletion bug.

index.html

@@ -142,10 +142,10 @@ <h2 id="qunit-userAgent"></h2>
     test('Compare shorter and shorterMissingLine:', function() {
         var result = dumbDiff.lines(snippets.shorter, snippets.shorterMissingLine);
         console.log(result)
-        equal(result.lines.length, 6, 'There were 6 different lines.');
+        equal(result.lines.length, 5, 'There were 5 different lines.');
         //equal(result.lines[0], 'DIFFERENT LINE 2', 'Diff contains the first line that is only present in the new version.');
         equal(result.rangeStart, 1, 'Diff range started at line 1.');
-        equal(result.rangeEnd, 7, 'Diff range ended at line 7.');
+        equal(result.rangeEnd, 5, 'Diff range ended at line 5.');
     });
 
     console.log(snippets);

src/dumbdiff.js

@@ -65,6 +65,11 @@
             differentLines = []; 
             diffRangeEnd = -1;
         } else {
+            // The new version is shorter than the old version.  The diff should contain everything from the first missing line to the end of the new version.
+            if (newer.length < older.length) {
+                diffRangeEnd = newer.length;
+            }
+
             differentLines = newer.slice(diffRangeStart, diffRangeEnd);
         }