[orca] Event Manager: Also ignore children-changed:add during an event flood

[Joanmarie Diggs <joanied src gnome org>]

commit 989596c9b97b72a9e854d0d402c62266b85b3dac
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Wed Jun 30 10:56:37 2021 +0200

    Event Manager: Also ignore children-changed:add during an event flood
    
    They are like text-changed events, and (at least) Firefox can be super
    spammy here.

 src/orca/event_manager.py | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/src/orca/event_manager.py b/src/orca/event_manager.py
index 197270782..e887c83e7 100644
--- a/src/orca/event_manager.py
+++ b/src/orca/event_manager.py
@@ -742,6 +742,8 @@ class EventManager:
                   "object:text-changed:insert",
                   "object:text-changed:delete:system",
                   "object:text-changed:insert:system",
+                  "object:children-changed:add",
+                  "object:children-changed:add:system",
                   "object:state-changed:showing",
                   "object:state-changed:sensitive"]
 
@@ -766,6 +768,8 @@ class EventManager:
                   "object:text-changed:insert",
                   "object:text-changed:delete:system",
                   "object:text-changed:insert:system",
+                  "object:children-changed:add",
+                  "object:children-changed:add:system",
                   "object:state-changed:showing",
                   "object:state-changed:sensitive"]