[orca] Don't treat objects with tons of embedded objects as text "chunks"

[Joanmarie Diggs <joanied src gnome org>]

commit 532fefacdb3714b6c8770217fd131f0aadab86a8
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Wed Jul 29 22:16:31 2015 -0400

    Don't treat objects with tons of embedded objects as text "chunks"

 src/orca/structural_navigation.py |   11 ++++++++---
 1 files changed, 8 insertions(+), 3 deletions(-)
---
diff --git a/src/orca/structural_navigation.py b/src/orca/structural_navigation.py
index be7ac4e..7fdf259 100644
--- a/src/orca/structural_navigation.py
+++ b/src/orca/structural_navigation.py
@@ -1570,12 +1570,17 @@ class StructuralNavigation:
           the criteria (e.g. the level of a heading).
         """
 
-        isMatch = False
         if obj and obj.getRole() in self.OBJECT_ROLES:
             text = self._script.utilities.queryNonEmptyText(obj)
-            isMatch = text and text.characterCount > settings.largeObjectTextLength
+            if not (text and text.characterCount > settings.largeObjectTextLength):
+                return False
 
-        return isMatch
+            string = text.getText(0, -1)
+            eocs = string.count(self._script.EMBEDDED_OBJECT_CHARACTER)
+            if eocs/text.characterCount < 0.05:
+                return True
+
+        return False
 
     def _chunkPresentation(self, obj, arg=None):
         """Presents the chunk or indicates that one was not found.