fix #3954

[nightwing]

No description provided.

[codecov]

Codecov Report

Merging #3972 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3972      +/-   ##
==========================================
- Coverage   69.48%   69.48%   -0.01%     
==========================================
  Files         517      517              
  Lines       50122    50154      +32     
  Branches     9462     9463       +1     
==========================================
+ Hits        34829    34850      +21     
- Misses      15293    15304      +11

Impacted Files	Coverage Δ
lib/ace/mode/behaviour/cstyle.js	89.49% <100%> (+0.55%)	⬆️
lib/ace/edit_session.js	85.12% <100%> (ø)	⬆️
lib/ace/mode/behaviour/behaviour_test.js	99.37% <100%> (+0.06%)	⬆️
lib/ace/mode/markdown_highlight_rules.js	59.09% <0%> (-27.28%)	⬇️

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