Small fixes

[nightwing]

• fix ace-linters in demo
• use spacer token for alignment instead of making meta token itself large
• do not use getValue in placeholder

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01 🎉

Comparison is base (2bb7fa0) 86.93% compared to head (9373ddf) 86.94%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5162      +/-   ##
==========================================
+ Coverage   86.93%   86.94%   +0.01%     
==========================================
  Files         561      561              
  Lines       44935    44965      +30     
  Branches     6909     6914       +5     
==========================================
+ Hits        39066    39097      +31     
+ Misses       5869     5868       -1     

Flag	Coverage Δ
unittests	86.94% <100.00%> (+0.01%)	⬆️

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

Impacted Files	Coverage Δ
src/autocomplete/popup.js	85.27% <100.00%> (+0.05%)	⬆️
src/autocomplete_test.js	99.35% <100.00%> (+0.07%)	⬆️
src/editor.js	80.57% <100.00%> (+0.01%)	⬆️

... and 1 file with indirect coverage changes

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