[orca] Clear AT-SPI2's cache on switcher object before checking showing and visible

[Joanmarie Diggs <joanied src gnome org>]

commit 4e8f00c4b6efe889f363ecf32ed15aa07ff69723
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Thu Mar 7 16:44:06 2019 +0100

    Clear AT-SPI2's cache on switcher object before checking showing and visible

 src/orca/scripts/switcher/script_utilities.py | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/src/orca/scripts/switcher/script_utilities.py b/src/orca/scripts/switcher/script_utilities.py
index fdf783cbf..efebc8652 100644
--- a/src/orca/scripts/switcher/script_utilities.py
+++ b/src/orca/scripts/switcher/script_utilities.py
@@ -73,6 +73,8 @@ class Utilities(script_utilities.Utilities):
         if index >= 0:
             return True
 
+        obj.clearCache()
+
         if self.isShowingAndVisible(obj):
             msg = "SWITCHER: Ignoring bad index of %s" % obj
             debug.println(debug.LEVEL_INFO, msg, True)