[orca] Eliminate double-presentation of custom selection messages

[Joanmarie Diggs <joanied src gnome org>]

commit 8dd65cd83a41a39f224c89d4500780041c72a11e
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Fri Mar 18 14:24:56 2016 -0400

    Eliminate double-presentation of custom selection messages

 src/orca/script_utilities.py |   10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)
---
diff --git a/src/orca/script_utilities.py b/src/orca/script_utilities.py
index c5e407e..9b4111e 100644
--- a/src/orca/script_utilities.py
+++ b/src/orca/script_utilities.py
@@ -4047,6 +4047,7 @@ class Utilities:
         self._script.pointOfReference['undo'] = False
         self._script.pointOfReference['redo'] = False
         self._script.pointOfReference['paste'] = False
+        self._script.pointOfReference['last-selection-message'] = ''
 
     def handleUndoTextEvent(self, event):
         if self.lastInputEventWasUndo():
@@ -4210,8 +4211,11 @@ class Utilities:
             else:
                 return True
 
-        if line:
+        if not line:
+            return False
+
+        if line != self._script.pointOfReference.get('last-selection-message'):
+            self._script.pointOfReference['last-selection-message'] = line
             self._script.speakMessage(line)
-            return True
 
-        return False
+        return True