Diff view papercuts

[nightwing]

• do not show bracket highlight of inactive editor in inline mode
• tweak color of active diff line
  https://raw.githack.com/ajaxorg/ace/diff-view-papercuts/demo/diff/index.html

[codecov]

Codecov Report

Attention: Patch coverage is 87.01299% with 10 lines in your changes missing coverage. Please review.

Project coverage is 87.47%. Comparing base (5209bd6) to head (2b3220b).

Files with missing lines	Patch %	Lines
src/ext/diff/inline_diff_view.js	72.72%	6 Missing ⚠️
src/ext/diff/base_diff_view.js	82.60%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5815      +/-   ##
==========================================
+ Coverage   87.45%   87.47%   +0.02%     
==========================================
  Files         611      613       +2     
  Lines       45669    45742      +73     
  Branches     7498     7506       +8     
==========================================
+ Hits        39938    40014      +76     
+ Misses       5731     5728       -3     

Flag	Coverage Δ
unittests	87.47% <87.01%> (+0.02%)	⬆️

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[marinsokol5]

There seems to be a bug when the active line is showed multiple times: