[orca] Eliminate another false positive clipboard/selection announcement

[Joanmarie Diggs <joanied src gnome org>]

commit abd255fca10842d40757e932f6fba83b2a6dcd0a
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Fri Mar 18 17:32:35 2016 -0400

    Eliminate another false positive clipboard/selection announcement

 src/orca/script_utilities.py |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/src/orca/script_utilities.py b/src/orca/script_utilities.py
index 9b4111e..50dea5c 100644
--- a/src/orca/script_utilities.py
+++ b/src/orca/script_utilities.py
@@ -3996,6 +3996,9 @@ class Utilities:
         if not self.lastInputEventWasCommand() or self.lastInputEventWasUndo():
             return False
 
+        if self.isBackSpaceCommandTextDeletionEvent(event):
+            return False
+
         if "delete" in event.type and self.lastInputEventWasPaste():
             return False