Fix failing UIA movement tests

[carlos-zamora]

Summary of the Pull Request

Follow-up for #10886. The new UIA movement tests found some failing cases. This PR fixes UiaTextRangeBase to have movement match that of MS Word. In total, this fixes 64 tests.

PR Checklist

• Closes Fix failing UIA tests from #10886 #10924
• Tests added/passed

Detailed Description of the Pull Request / Additional comments

Root causes include...

1. if we were a non-degenerate range and we failed to move, we should still expand to enclose the unit
2. non-degenerate ranges are treated as if they already encompassed their given unit.
   • this one is a bit difficult to explain. Consider these examples:
     1. document movement
        • state: you have a 1-cell wide range on the buffer, and you try to move by document
        • result: move by 0 (there is no next/prev document), but the range now encompasses the entire document
     2. line movement
        • state: you have a 1-cell wide range on a line, and you try to move back by a line
        • result: you go to the previous line (not the beginning of this line)
   • conversely, a degenerate range successfully moves to the beginning/end of the current unit (i.e. document/line)
   • this (bizarre) behavior was confirmed using MS Word

As a bonus, occasionally, Narrator would get stuck when navigating by line. This issue now seems to be fixed.

Updates to existing tests

• CanMoveByCharacter
  • can't move backward from (0, 0) --> misauthored, result should be one character wide.
  • can't move past the last column in the last row --> misauthored and already covered in generated tests
• CanMoveByLine
  • can't move backward from top row --> misauthored, end should be on next line. Already covered by generated tests
  • can't move forward from bottom row --> misauthored, end should be on next line
  • can't move backward when part of the top row is in the range --> misauthored, should expand
  • can't move forward when part of the bottom row is in the range --> misauthored, degenerate range moves to end of buffer
• MovementAtExclusiveEnd
  • populate the text buffer before we do a move by word operation
  • update to match the now fixed behavior

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[ghost]

🎉Windows Terminal Preview v1.10.2383.0 has been released which incorporates this pull request.:tada:

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[ghost]

🎉Windows Terminal Preview v1.11.2421.0 has been released which incorporates this pull request.:tada:

Handy links:

• Release Notes
• Store Download