imgui: make widget not be brought to front on focus

[exbluesbreaker]

For now only done for cheatsheet, can be update with better clarification on expected behavior - which kind of widgets are affected.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.91%. Comparing base (93a117f) to head (7388f87).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2118      +/-   ##
==========================================
- Coverage   95.94%   95.91%   -0.03%     
==========================================
  Files         127      127              
  Lines       11095    11097       +2     
==========================================
- Hits        10645    10644       -1     
- Misses        450      453       +3     

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[exbluesbreaker]

There are some issues, I will have a look probably on Friday

[mwestphal]

Windows failures are unrelated, fyi

[mwestphal]

DO you reproduce the test failure from linux CI locally ?

[exbluesbreaker]

DO you reproduce the test failure from linux CI locally ?

I will have a look tonight

[exbluesbreaker]

As far as I am concerned f3d::TestInteractionCheatsheetNoFile fails on earlier VTK versions. There is some slight difference in images