[orca] Aggressively clear cached text and language attributes

[Joanmarie Diggs <joanied src gnome org>]

commit cece99390724c24088dfe7f48783cb093c6cffc1
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Fri Jan 7 14:36:42 2022 +0100

    Aggressively clear cached text and language attributes
    
    If content changes we can have broken or incomplete ranges.

 src/orca/scripts/web/script_utilities.py | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/src/orca/scripts/web/script_utilities.py b/src/orca/scripts/web/script_utilities.py
index ad9480863..cff16fb7b 100644
--- a/src/orca/scripts/web/script_utilities.py
+++ b/src/orca/scripts/web/script_utilities.py
@@ -226,6 +226,8 @@ class Utilities(script_utilities.Utilities):
         self._currentWordContents = None
         self._currentCharacterContents = None
         self._currentTextAttrs = {}
+        self._allTextAttrs = {}
+        self._languageAndDialects = {}
 
     def isDocument(self, obj):
         if not obj: