Add resize handler for FloatPanel

[philippjfr]

Fixes #6157

• Add test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (15ba95e) 84.45% compared to head (b837286) 82.95%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6201      +/-   ##
==========================================
- Coverage   84.45%   82.95%   -1.50%     
==========================================
  Files         299      299              
  Lines       44677    44685       +8     
==========================================
- Hits        37730    37070     -660     
- Misses       6947     7615     +668     

Flag	Coverage Δ
ui-tests	38.43% <100.00%> (-2.24%)	⬇️
unitexamples-tests	72.23% <22.22%> (-0.02%)	⬇️

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