fix(a11y): update aria-label of textinput on cursor move

[babalaui]

Issue #, if available:

Description of changes: The aria-label on ace text-input ("Cursor at row X"), was being set only on focus, which means that if the cursor moved within the editor, the label would still be set for the initial row. This lead to the screen reader announcing the wrong row number when accepting a suggestion.

With this change, the aria-label will be updated on every cursor change.

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 87.01%. Comparing base (25d3fee) to head (dbdfd97).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5665   +/-   ##
=======================================
  Coverage   87.01%   87.01%           
=======================================
  Files         598      598           
  Lines       43666    43681   +15     
  Branches     7205     7205           
=======================================
+ Hits        37995    38010   +15     
  Misses       5671     5671           

Flag	Coverage Δ
unittests	87.01% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[akoreman]

Change looks good to me, did you verify that the screen reader doesn't read the updated aria label on every cursor change?

[babalaui]

@akoreman yep, verified on mac os + voiceover, screen reader still only reads it when focusing editor.