[orca] Ensure we handle selection-change events from web app descendants

[Joanmarie Diggs <joanied src gnome org>]

commit 122a11f408962883b8f29a4700df6eb4a0c2002f
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Tue Mar 31 12:32:01 2020 -0400

    Ensure we handle selection-change events from web app descendants

 src/orca/scripts/web/script.py | 5 +++++
 1 file changed, 5 insertions(+)
---
diff --git a/src/orca/scripts/web/script.py b/src/orca/scripts/web/script.py
index d18ab7a4c..b66032f92 100644
--- a/src/orca/scripts/web/script.py
+++ b/src/orca/scripts/web/script.py
@@ -2004,6 +2004,11 @@ class Script(default.Script):
             debug.println(debug.LEVEL_INFO, msg, True)
             return True
 
+        if self.utilities.isWebAppDescendant(event.source):
+            msg = "WEB: Event source is web app descendant"
+            debug.println(debug.LEVEL_INFO, msg, True)
+            return False
+
         obj, offset = self.utilities.getCaretContext()
         ancestor = self.utilities.commonAncestor(obj, event.source)
         if ancestor and self.utilities.isTextBlockElement(ancestor):