[orca] Ignore children-changed events from layered panes

[Joanmarie Diggs <joanied src gnome org>]

commit 244b31161a5629daa1a11fb25796357f5fd9c37d
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Fri Apr 20 11:46:28 2018 -0400

    Ignore children-changed events from layered panes
    
    Event floods are bad.

 src/orca/event_manager.py |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/orca/event_manager.py b/src/orca/event_manager.py
index 21503df..5aaa1b6 100644
--- a/src/orca/event_manager.py
+++ b/src/orca/event_manager.py
@@ -168,6 +168,7 @@ class EventManager:
 
         if event.type.startswith('object:children-changed:add'):
             if role in [pyatspi.ROLE_MENU,
+                        pyatspi.ROLE_LAYERED_PANE,
                         pyatspi.ROLE_MENU_ITEM]:
                 msg = 'EVENT MANAGER: Ignoring event type due to role'
                 debug.println(debug.LEVEL_INFO, msg, True)