Showing a warning message box for problematic settings

[yshui]

picom will show you something like this if you have been naughty with your configs.

(typo in this image has been fixed)

[codecov]

Codecov Report

Attention: Patch coverage is 13.16964% with 389 lines in your changes missing coverage. Please review.

Project coverage is 58.13%. Comparing base (5af574d) to head (81bd3b9).
Report is 11 commits behind head on next.

Files with missing lines	Patch %	Lines
src/utils/ui.c	0.00%	251 Missing ⚠️
src/picom.c	10.00%	36 Missing ⚠️
src/utils/process.c	0.00%	33 Missing ⚠️
src/config_libconfig.c	49.01%	26 Missing ⚠️
src/config.h	0.00%	15 Missing ⚠️
src/options.c	0.00%	15 Missing ⚠️
src/utils/misc.h	0.00%	6 Missing ⚠️
src/x.c	54.54%	5 Missing ⚠️
src/c2.c	95.45%	1 Missing ⚠️
src/transition/script.c	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             next    #1366      +/-   ##
==========================================
- Coverage   59.81%   58.13%   -1.69%     
==========================================
  Files          66       68       +2     
  Lines       13392    13743     +351     
==========================================
- Hits         8011     7989      -22     
- Misses       5381     5754     +373     

Files with missing lines	Coverage Δ
src/backend/gl/gl_common.c	65.67% <100.00%> (ø)
src/c2.h	100.00% <ø> (ø)
src/common.h	84.61% <ø> (-7.70%)	⬇️
src/log.h	76.47% <ø> (ø)
src/utils/misc.c	0.00% <ø> (ø)
src/vblank.c	0.00% <ø> (ø)
src/wm/win.c	74.71% <ø> (-0.70%)	⬇️
src/wm/win.h	72.72% <ø> (ø)
src/x.h	83.33% <ø> (ø)
src/c2.c	56.62% <95.45%> (-0.02%)	⬇️
... and 9 more

... and 4 files with indirect coverage changes