[orca] Ignore (for now) text-attributes-changed signals from LibreOffice

[Joanmarie Diggs <joanied src gnome org>]

commit e62b45bb90544fa3aa5cb3b5935af0e3005a10fc
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Wed Nov 13 00:29:33 2013 -0500

    Ignore (for now) text-attributes-changed signals from LibreOffice
    
    LibreOffice emits this signal nearly every time text is typed,
    even though the text attributes haven't changed:
    https://bugs.freedesktop.org/show_bug.cgi?id=71556
    
    LibreOffice fails to emit this signal the main time we are looking
    for it, namely to present that a misspelled word was typed:
    https://bugs.freedesktop.org/show_bug.cgi?id=71558
    
    Useless signals are useless.

 src/orca/scripts/apps/soffice/script.py |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)
---
diff --git a/src/orca/scripts/apps/soffice/script.py b/src/orca/scripts/apps/soffice/script.py
index ab68491..d2b9078 100644
--- a/src/orca/scripts/apps/soffice/script.py
+++ b/src/orca/scripts/apps/soffice/script.py
@@ -973,6 +973,20 @@ class Script(default.Script):
         if weToggledIt:
             speech.speak(self.speechGenerator.generateSpeech(obj))
 
+    def onTextAttributesChanged(self, event):
+        """Callback for object:text-attributes-changed accessibility events."""
+
+        # LibreOffice emits this signal nearly every time text is typed,
+        # even though the text attributes haven't changed:
+        # https://bugs.freedesktop.org/show_bug.cgi?id=71556
+
+        # LibreOffice fails to emit this signal the main time we are looking
+        # for it, namely to present that a misspelled word was typed:
+        # https://bugs.freedesktop.org/show_bug.cgi?id=71558
+
+        # Useless signals are useless.
+        pass
+
     def getTextLineAtCaret(self, obj, offset=None):
         """Gets the line of text where the caret is. Overridden here to
         handle combo boxes who have a text object with a caret offset