Fix issue 11914: In DarkMode: Add a default color to the ProcessBar.

[SimonZhao888]

Fixes #11914

Proposed changes

• Add a default ForeColor, BackColor to the ProcessBar.

Customer Impact

• The ProcessBar displays correctly in dark mode.

Regression?

• Yes

Risk

• Min

Screenshots

Before

After

Test methodology

• Manually

Test environment(s)

• 11.0.100-preview.1.26104.118

Microsoft Reviewers: Open in CodeFlow

[Copilot]

Pull request overview

Updates the WinForms ProgressBar dark mode initialization to apply specific colors when Application.IsDarkModeEnabled is true, to improve default appearance under dark mode.

Changes:

• In ProgressBar.OnCreateControl, sets BackColor to SystemColors.ControlDarkDark and ForeColor to SystemColors.Highlight when dark mode is enabled.
• Disables visual styles for the native ProgressBar via SetWindowTheme in dark mode.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 52.28515%. Comparing base (a4d6573) to head (2faadbb).
⚠️ Report is 1 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (a4d6573) and HEAD (2faadbb). Click for more details.

HEAD has 10 uploads less than BASE

Flag	BASE (a4d6573)	HEAD (2faadbb)
Debug	6	2
production	4	2
unit	2	1
integration	2	1
test	2	0

Additional details and impacted files

@@                 Coverage Diff                  @@
##                main      #14339          +/-   ##
====================================================
- Coverage   77.24039%   52.28515%   -24.95525%     
====================================================
  Files           3280        2050        -1230     
  Lines         645112      287049      -358063     
  Branches       47731       42033        -5698     
====================================================
- Hits          498287      150084      -348203     
+ Misses        143133      134065        -9068     
+ Partials        3692        2900         -792     

Flag	Coverage Δ
Debug	52.28515% <0.00000%> (-24.95525%)	⬇️
integration	19.12043% <0.00000%> (+0.02724%)	⬆️
production	52.28515% <0.00000%> (+0.10743%)	⬆️
test	?
unit	49.64518% <0.00000%> (+0.08503%)	⬆️

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[LeafShi1]

@SimonZhao888 The contrast between the progress bar's color and the background is insufficient, even in Classic mode; further modifications may be needed in both modes.

DarkMode:

Classic Mode:

CC: @KlausLoeffelmann