[orca] Event Manager: Add state-changed:showing to ignore worthy during floods

[Joanmarie Diggs <joanied src gnome org>]

commit 64a5f70af8d920cbbfc2dd9014c0793ba9122903
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Mon Jun 14 14:25:14 2021 +0200

    Event Manager: Add state-changed:showing to ignore worthy during floods
    
    gnome-disks and gnome-shell mainly

 src/orca/event_manager.py | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/src/orca/event_manager.py b/src/orca/event_manager.py
index 43ced69cc..bdc20e346 100644
--- a/src/orca/event_manager.py
+++ b/src/orca/event_manager.py
@@ -740,6 +740,7 @@ class EventManager:
 
         ignore = ["object:text-changed:delete",
                   "object:text-changed:insert",
+                  "object:state-changed:showing",
                   "object:state-changed:sensitive"]
 
         if event.type not in ignore:
@@ -761,6 +762,7 @@ class EventManager:
 
         ignore = ["object:text-changed:delete",
                   "object:text-changed:insert",
+                  "object:state-changed:showing",
                   "object:state-changed:sensitive"]
 
         if event.type not in ignore: