fix background style with soft wrap

[willmcgugan]

Fixes #3838

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.87%. Comparing base (56855a6) to head (2c247e6).
⚠️ Report is 174 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3938      +/-   ##
==========================================
+ Coverage   97.84%   97.87%   +0.02%     
==========================================
  Files          74       96      +22     
  Lines        8152     8358     +206     
==========================================
+ Hits         7976     8180     +204     
- Misses        176      178       +2     

Flag	Coverage Δ
unittests	97.87% <100.00%> (+0.02%)	⬆️

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