fix(AcePopup): fix aria-posinset issue on google chrome

[xyos]

Description of changes:

This change addresses an issue in Chromium where an incorrect sequence of aria-posinset values can occur when navigating from bottom to top using the keyboard. This wrong order of posinset sequence causes screen readers to announce an incorrect total count of items, even when aria-setsize is explicitly defined. The fix ensures only the selected item will have aria-posinset so we can maintain correct accessibility behavior across screen readers.

before change:

Screen.Recording.2025-01-16.at.1.01.57.PM.mov

after change:

Screen.Recording.2025-01-16.at.1.03.07.PM.mov

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

Pull Request Checklist:

• No backwards incompatible changes were made to Ace's public interface which is defined through the main typings file (ace.d.ts) and its references:
  • https://github.com/ajaxorg/ace/blob/master/ace.d.ts
  • https://github.com/ajaxorg/ace/blob/master/ace-modes.d.ts
  • https://github.com/ajaxorg/ace/blob/master/ace-extensions.d.ts

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.03%. Comparing base (85f01ca) to head (741f601).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5719      +/-   ##
==========================================
+ Coverage   87.02%   87.03%   +0.01%     
==========================================
  Files         598      598              
  Lines       43593    43628      +35     
  Branches     7163     7163              
==========================================
+ Hits        37936    37971      +35     
  Misses       5657     5657              

Flag	Coverage Δ
unittests	87.03% <100.00%> (+0.01%)	⬆️

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