Disable style navigation quickNav in MS Word

[mltony]

Link to issue number:

#16546

Summary of the issue:

Style navigation is too slow in MSWord even with UIA enabled.

Description of user facing changes

Message "not supported in this document" is spoken when trying style navigation in MSWord.

Description of development approach

I did a bit of refactoring. Instead of trying to catch all the conditions in browseMode.BrowseModeDocumentTreeInterceptor, I overrode _iterTextStyle() method in corresponding child subclasses.

Testing strategy:

Tested manually with both UIA enabled and disabled in both MSWord and Outlook.

Known issues with pull request:

N/A

Code Review Checklist:

• [x] Documentation:
  • Change log entry
  • User Documentation
  • Developer / Technical Documentation
  • Context sensitive help for GUI changes
• [x] Testing:
  • Unit tests
  • System (end to end) tests
  • Manual testing
• [x] UX of all users considered:
  • Speech
  • Braille
  • Low Vision
  • Different web browsers
  • Localization in other languages / culture than English
• [x] API is compatible with existing add-ons.
• [x] Security precautions taken.