fix: Enhance bracket indentation handling for square brackets

[anijanyan]

Issue #, if available: #3000

Description of changes:

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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

Open kitchen-sink @ beacfdd0c989634787534528a25cea99309b9cfb

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.69%. Comparing base (a467a6c) to head (beacfdd).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5939      +/-   ##
==========================================
- Coverage   93.72%   93.69%   -0.04%     
==========================================
  Files         634      634              
  Lines      137322   137347      +25     
  Branches    14468    14457      -11     
==========================================
- Hits       128708   128690      -18     
- Misses       8614     8657      +43     

Flag	Coverage Δ
unittests	93.69% <100.00%> (-0.04%)	⬇️

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