[orca] Chromium: More work on live region support

[Joanmarie Diggs <joanied src gnome org>]

commit d59d0e233988945ef15ad9f8b13e9b68fc301cb2
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Thu Jul 18 10:04:02 2019 -0400

    Chromium: More work on live region support

 src/orca/scripts/toolkits/Chromium/script_utilities.py | 13 ++++++-------
 src/orca/scripts/web/script_utilities.py               |  3 ---
 2 files changed, 6 insertions(+), 10 deletions(-)
---
diff --git a/src/orca/scripts/toolkits/Chromium/script_utilities.py 
b/src/orca/scripts/toolkits/Chromium/script_utilities.py
index 54f8b0488..a753af831 100644
--- a/src/orca/scripts/toolkits/Chromium/script_utilities.py
+++ b/src/orca/scripts/toolkits/Chromium/script_utilities.py
@@ -346,12 +346,11 @@ class Utilities(web.Utilities):
         # followed by children-changed events to tell us that the object whose text
         # changed is now being added to the accessibility tree. Furthermore the
         # additions are not always coming to us in presentational order, whereas
-        # the text changes appear to be.
-        if isinstance(event.any_data, pyatspi.Accessible):
-            pEvent, pTime = self._mostRecentLiveRegionEvent.get(hash(event.any_data), ("", 0))
-            if pEvent.startswith("object-text-changed:insert") and time.time() - pTime < 0.5:
-                msg = "CHROMIUM: Event is believed to be redundant live region notification"
-                debug.println(debug.LEVEL_INFO, msg, True)
-                return False
+        # the text changes appear to be. Since testing thus far suggests we can rely
+        # upon the text insertions, ignore the children-changed events.
+        if event.type.startswith("object:children-changed:add"):
+            msg = "CHROMIUM: Event is believed to be redundant live region notification"
+            debug.println(debug.LEVEL_INFO, msg, True)
+            return False
 
         return super().handleAsLiveRegion(event)
diff --git a/src/orca/scripts/web/script_utilities.py b/src/orca/scripts/web/script_utilities.py
index b39e8445b..d5d4af7d9 100644
--- a/src/orca/scripts/web/script_utilities.py
+++ b/src/orca/scripts/web/script_utilities.py
@@ -87,7 +87,6 @@ class Utilities(script_utilities.Utilities):
         self._isInlineListDescendant = {}
         self._isLandmark = {}
         self._isLiveRegion = {}
-        self._mostRecentLiveRegionEvent = {}
         self._isLink = {}
         self._isNonNavigablePopup = {}
         self._isNonEntryTextWidget = {}
@@ -166,7 +165,6 @@ class Utilities(script_utilities.Utilities):
         self._isInlineListDescendant = {}
         self._isLandmark = {}
         self._isLiveRegion = {}
-        self._mostRecentLiveRegionEvent = {}
         self._isLink = {}
         self._isNonNavigablePopup = {}
         self._isNonEntryTextWidget = {}
@@ -4288,7 +4286,6 @@ class Utilities(script_utilities.Utilities):
                 return False
 
         self._lastQueuedLiveRegionEvent = event
-        self._mostRecentLiveRegionEvent[hash(event.source)] = (event.type, time.time())
         return True
 
     def getPageObjectCount(self, obj):