[orca] Fix for bug 674693 - Modifier keys pressed alone should interrupt speech

[Joanmarie Diggs <joanied src gnome org>]

commit 64f74b73e523cb7edaef87ac61a6471033eed964
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Mon Apr 30 09:18:00 2012 -0400

    Fix for bug 674693 - Modifier keys pressed alone should interrupt speech

 src/orca/orca.py |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/orca/orca.py b/src/orca/orca.py
index 57306e4..5e3d61a 100644
--- a/src/orca/orca.py
+++ b/src/orca/orca.py
@@ -578,6 +578,8 @@ def _processKeyboardEvent(event):
         if isPressedEvent:
             script.presentationInterrupt()
         keyboardEvent.present()
+        if keyboardEvent.isModifierKey() and not isOrcaModifier:
+            return False
  
     # Special modes.
     if not isPressedEvent and keyboardEvent.event_string == "Escape":