[orca] Don't present busy-changed events from pages which have no URI

[Joanmarie Diggs <joanied src gnome org>]

commit 661e0a23a216890c9dfb8b46aea26f6e70a346cc
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Fri Apr 10 17:31:44 2020 -0400

    Don't present busy-changed events from pages which have no URI
    
    When browsers spew object:state-changed:busy events for documents
    with are either zombies and/or lack an obtainable URI we should
    ignore these events. A bunch of loading messages without info is
    just noise.

 src/orca/scripts/web/script.py | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)
---
diff --git a/src/orca/scripts/web/script.py b/src/orca/scripts/web/script.py
index 6fef561d9..e286a188f 100644
--- a/src/orca/scripts/web/script.py
+++ b/src/orca/scripts/web/script.py
@@ -1341,7 +1341,16 @@ class Script(default.Script):
         if not obj or self.utilities.isZombie(obj):
             self.utilities.clearCaretContext()
 
-        shouldPresent = self.utilities.isShowingOrVisible(event.source)
+        shouldPresent = True
+        if not self.utilities.isShowingOrVisible(event.source):
+            shouldPresent = False
+            msg = "WEB: Not presenting because source is not showing or visible"
+            debug.println(debug.LEVEL_INFO, msg, True)
+        elif not self.utilities.documentFrameURI(event.source):
+            shouldPresent = False
+            msg = "WEB: Not presenting because source lacks URI"
+            debug.println(debug.LEVEL_INFO, msg, True)
+
         if not _settingsManager.getSetting('onlySpeakDisplayedText') and shouldPresent:
             if event.detail1:
                 self.presentMessage(messages.PAGE_LOADING_START)