Link to issue number:

Fixup of #14487

Summary of the issue:

NVDA can only detect the lock screen windows, and windows below the lock screen, if NVDA has UI Access.
When running a portable copy, or NVDA from source, locking NVDA causes an error every cache cycle due to the lock screen not being detected.
#14487 checked installation status., but checking UIAccess is a more accurate approach.

Description of user facing changes

logging/error sounds are suppressed when locking Windows and using a portable or source copy of NVDA

Description of development approach

Lock screen z-order is only checked if the current running version of NVDA has UIAccess (e.g. is installed normally).

Testing strategy:

Smoke test the lock screen with a portable, installed and source copy of NVDA.

Known issues with pull request:

None

Change log entries:

None

Code Review Checklist:

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