Dark Mode issues Fixes

[memoarfaa]

Fix Dark Mode issues

Fixes #12027
Fixes #12992
Fixes #12991
Fixes #12582
Fixes #11941
Fixes #11932

Microsoft Reviewers: Open in CodeFlow

[codecov]

Codecov Report

Attention: Patch coverage is 22.41379% with 45 lines in your changes missing coverage. Please review.

Project coverage is 76.59997%. Comparing base (716bc12) to head (fcdac7c).

Additional details and impacted files

@@                 Coverage Diff                 @@
##                main      #13474         +/-   ##
===================================================
+ Coverage   76.59823%   76.59997%   +0.00173%     
===================================================
  Files           3230        3230                 
  Lines         639097      639153         +56     
  Branches       47289       47297          +8     
===================================================
+ Hits          489537      489591         +54     
+ Misses        145992      145984          -8     
- Partials        3568        3578         +10     

Flag	Coverage Δ
Debug	76.59997% <22.41379%> (+0.00173%)	⬆️
integration	18.79560% <18.96552%> (+0.01347%)	⬆️
production	51.00769% <22.41379%> (+0.00887%)	⬆️
test	97.40411% <ø> (ø)
unit	48.41589% <22.41379%> (+0.02962%)	⬆️

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[KlausLoeffelmann]

Hey @memoarfaa,

thanks for this PR, but let's try to coordinate the efforts here, so we're not doing redundant work.
Can you explain, which parts of the your PR is addressing which Issues, and point out the background a bit?

We'll be addressing for Preview 5 (maybe early 6) the PRs which I did, since they had been planned and championed. We only have Monday 19th to complete testing, reviews and merge them, so the Preview 5 ship for any pivoting in approaches has sailed.

For Preview 6, I'd love to re-discuss approaches, though, so, let's keep the discussion rolling for improvements for the Preview 6 time frame!

PS:
If you have a good, feasible idea or approach, which we could take on (really!) short notice for the background-coloring of a read-only TextBox or RTF TextBox in DarkMode, without changing the default color (which would be too invasive), that would be really cool!!