Fix Try Dart handling of Backspace that joins lines

site/try/src/interaction_manager.dart

Index: site/try/src/interaction_manager.dart
diff --git a/site/try/src/interaction_manager.dart b/site/try/src/interaction_manager.dart
index 3776dc23014dc3cf52fde88b4c2757f84d77b426..2dc2aa8e820b380689a8109ca53540b60ef6afea 100644
--- a/site/try/src/interaction_manager.dart
+++ b/site/try/src/interaction_manager.dart
@@ -1234,7 +1234,7 @@ void normalizeMutationRecord(MutationRecord record,
     var first = record.removedNodes.first;
     var line = findLine(record.target);
 
-    if (first is Text && first.data=="\n" && line.nextNode != null) {
+    if (first is Text && line.nextNode != null) {

[ahe, 2014/09/04 11:42:36]

Does this have a significant impact on when we can detect single line changes
when you hit backspace?

[aam-me, 2014/09/04 12:01:06]

Your question is about impact in those cases when lines are not being merged?
Certainly there is impact(we always normalize current plus next line), not sure
how to measure it though.

We can try to limit this change to only those cases when we are certain lines
are being merged.(selection is at the end of the line/start of the line?)
Do you remember what was the rationale for checking first.data=='\n'? Must be
something along similar lines.

[ahe, 2014/09/04 12:11:10]

I normally just look at the console and make some changes.
It was an attempt to identify this problem more precisely.

Perhaps a better approach is to change the "single line change" to "consecutive
lines changed".

       normalizedNodes.add(line.nextNode);
     }
     normalizedNodes.add(line);