[orca] Fix MathML line navigation issue

[Joanmarie Diggs <joanied src gnome org>]

commit 602266852fbc4c02cf2aee0d54a5338eaebafac6
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Fri Aug 28 11:56:42 2015 -0400

    Fix MathML line navigation issue

 src/orca/scripts/web/script_utilities.py |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/orca/scripts/web/script_utilities.py b/src/orca/scripts/web/script_utilities.py
index 4c7285b..d96a772 100644
--- a/src/orca/scripts/web/script_utilities.py
+++ b/src/orca/scripts/web/script_utilities.py
@@ -1085,8 +1085,8 @@ class Utilities(script_utilities.Utilities):
             return objects
 
         firstObj, firstStart, firstEnd, firstString = objects[0]
-        if extents[2] == 0 and extents[3] == 0:
-            extents = self.getExtents(obj, firstStart, firstEnd)
+        if (extents[2] == 0 and extents[3] == 0) or self.isMath(firstObj):
+            extents = self.getExtents(firstObj, firstStart, firstEnd)
 
         lastObj, lastStart, lastEnd, lastString = objects[-1]
         prevObj, pOffset = self.findPreviousCaretInOrder(firstObj, firstStart)