Fix the handling of line offset when getting the source line from a ScriptMirror

src/messages.js

Index: src/messages.js
===================================================================
--- src/messages.js	(revision 1480)
+++ src/messages.js	(working copy)
@@ -302,7 +302,7 @@
   var offset_position = opt_offset_position || 0;
   if (line < 0 || column < 0 || offset_position < 0) return null;
   if (line == 0) {
-    return this.locationFromPosition(offset_position + column);
+    return this.locationFromPosition(offset_position + column, false);
   } else {
     // Find the line where the offset position is located
     var lineCount = this.lineCount();
@@ -519,7 +519,7 @@
 // Returns the offset of the given position within the containing
 // line.
 function GetPositionInLine(message) {
-  var location = message.script.locationFromPosition(message.startPos);
+  var location = message.script.locationFromPosition(message.startPos, false);
   if (location == null) return -1;
   location.restrict();
   return message.startPos - location.start;