[stable5.0] fix: Events with overlapping time visually overlap

[backportbot]

Backport of PR #6283

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 15.45%. Comparing base (8740dd1) to head (8c5e9ba).
Report is 3 commits behind head on stable5.0.

Additional details and impacted files

@@            Coverage Diff             @@
##           stable5.0    #6284   +/-   ##
==========================================
  Coverage      15.45%   15.45%           
==========================================
  Files            205      205           
  Lines           9426     9426           
  Branches        2199     2199           
==========================================
  Hits            1457     1457           
+ Misses          7654     7653    -1     
- Partials         315      316    +1     

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