[orca] Ignore children-changed:add events if they are not from the active app

[Joanmarie Diggs <joanied src gnome org>]

commit caad6ea521f93ba6a2df446c06d633345c729558
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Sun Feb 28 11:52:20 2016 -0500

    Ignore children-changed:add events if they are not from the active app

 src/orca/event_manager.py |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)
---
diff --git a/src/orca/event_manager.py b/src/orca/event_manager.py
index 4576aae..de9a0a7 100644
--- a/src/orca/event_manager.py
+++ b/src/orca/event_manager.py
@@ -117,6 +117,17 @@ class EventManager:
             debug.println(debug.LEVEL_INFO, msg, True)
             return False
 
+        script = orca_state.activeScript
+        if event.type.startswith('object:children-changed:add'):
+            if not script:
+                msg = 'EVENT MANAGER: Ignoring because there is no active script'
+                debug.println(debug.LEVEL_INFO, msg, True)
+                return True
+            if script.app != event.host_application:
+                msg = 'EVENT MANAGER: Ignoring because event is not from active app'
+                debug.println(debug.LEVEL_INFO, msg, True)
+                return True
+
         # This should ultimately be changed as there are valid reasons
         # to handle these events at the application level.
         if event.type.startswith('object:children-changed:remove') \