[FIX] Reconfigure stylesheet on application palette change

[ales-erjavec]

Issue

Fixes biolab/orange3#6653

Changes

Reconfigure stylesheet on application palette change

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (cbf2e9a) 75.57% compared to head (76e5981) 75.63%.
Report is 2 commits behind head on master.

Files	Patch %	Lines
orangecanvas/main.py	90.90%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #291      +/-   ##
==========================================
+ Coverage   75.57%   75.63%   +0.06%     
==========================================
  Files          99       99              
  Lines       21047    21066      +19     
==========================================
+ Hits        15906    15934      +28     
+ Misses       5141     5132       -9     

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[janezd]

I could reproduce the bug - labels indeed disappeared. After this PR, switching to dark mode has no effect - that is, labels remain black (and background remains white). Was this the intention?

[ales-erjavec]

No. It is supposed to change:

What version of PyQt do you have installed? I am testing with PyQt6 6.5

[janezd]

Note from Slack: Python 3.10 from Conda is linked with macOS SDK 10.9 and does not receive palette change events. As suggested by @ales-erjavec, I tried with 3.11 and it works.