Link to issue number:

Twitter thread.

Summary of the issue:

In LiveText objects that are constrained to onscreen text (i.e. where text scrolls off the screen), DMP is sometimes unable to correctly calculate new text, leading to choppy and inconsistent new text reporting.

Description of how this pull request fixes the issue:

Prefer Difflib in pre-FORMATTED UIA console (including legacy mode) and DisplayModelLiveText objects. Users can override this choice in advanced settings for testing or if DMP really provides a supperior experience in their situation.

Testing strategy:

Tested the following scenarios:

Known issues with pull request:

None known.

Change log entries:

== Bug Fixes ==

• Improved consistency of output reading in terminal programs.
  • Note that in some situations, when inserting or deleting characters in the middle of a line, the characters after the caret may again be read out.

== Changes for Developers ==

• diffHandler.get_dmp_algo and diffHandler.get_difflib_algo renamed diffHandler.prefer_dmp and diffHandler.prefer_difflib respectively.

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