Diff editor sync marker by column

[anijanyan]

Issue #, if available:

Description of changes:

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

Attention: Patch coverage is 96.61017% with 2 lines in your changes missing coverage. Please review.

Project coverage is 87.78%. Comparing base (0207e6d) to head (a03b6e0).
Report is 8 commits behind head on master.

Files with missing lines	Patch %	Lines
src/ext/diff/base_diff_view.js	88.88%	1 Missing ⚠️
src/ext/diff/split_diff_view.js	96.96%	1 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@ ## master #5810 +/- ## ========================================== + Coverage 87.77% 87.78% +0.01%  ========================================== Files 620 620 Lines 46096 46136 +40 Branches 7559 7562 +3 ========================================== + Hits 40461 40501 +40  Misses 5635 5635 

Flag	Coverage Δ
unittests	87.78% <96.61%> (+0.01%)	⬆️

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