[orca] Treat zombified objects as non-existent for the purpose of ancestor generation

[Joanmarie Diggs <joanied src gnome org>]

commit f4eb81e25f5fdde55095abd027606c91b157a5e8
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Tue Aug 20 15:25:52 2019 -0400

    Treat zombified objects as non-existent for the purpose of ancestor generation

 src/orca/speech_generator.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/orca/speech_generator.py b/src/orca/speech_generator.py
index 156d7eb13..6a7b6ae21 100644
--- a/src/orca/speech_generator.py
+++ b/src/orca/speech_generator.py
@@ -1829,7 +1829,7 @@ class SpeechGenerator(generator.Generator):
             return []
 
         priorObj = args.get('priorObj')
-        if not priorObj or obj == priorObj:
+        if not priorObj or obj == priorObj or self._script.utilities.isZombie(priorObj):
             return []
 
         if obj.getRole() == pyatspi.ROLE_PAGE_TAB: