Changing the renderMode to System when the StatusStrip was selected

[LeafShi1]

Fixes #12616

Proposed changes

• Revert the changes on PR fix issue 11450 Color contrast ratio of focus indicator over 'toolStripSplitButton1' is 1.247:1 which is less than 3:1: A11y_.NET CoreWinforms_StripControls_Toolstripwithmenuitem_NonTextContrast #11502, and changing the renderMode to ToolStripRenderMode.System when the StatusStrip was selected

Customer Impact

• When upgrading a project with StatusStrip from .net8.0 to .net9.0, there will no longer be extra white lines in the Form

Regression?

• Yes

Risk

• Minimal

Screenshots

Before

A white line in the dialog when using StatusStrip

After

No extra white line the dialog

Test methodology

• Manually

Test environment(s)

• .net 10.0.0-alpha.1.24606.5

Microsoft Reviewers: Open in CodeFlow

[codecov]

Codecov Report

Attention: Patch coverage is 76.47059% with 4 lines in your changes missing coverage. Please review.

Project coverage is 76.00079%. Comparing base (a5281d9) to head (834c874).
Report is 6 commits behind head on main.

Additional details and impacted files

@@                 Coverage Diff                  @@
##                main      #12646          +/-   ##
====================================================
- Coverage   97.03492%   76.00079%   -21.03414%     
====================================================
  Files           1182        3176        +1994     
  Lines         354561      638946      +284385     
  Branches        5411       47174       +41763     
====================================================
+ Hits          344048      485604      +141556     
- Misses          9724      149838      +140114     
- Partials         789        3504        +2715     

Flag	Coverage Δ
Debug	76.00079% <76.47059%> (-21.03414%)	⬇️
integration	18.12917% <0.00000%> (?)
production	49.77513% <63.63636%> (?)
test	97.03577% <100.00000%> (+0.00084%)	⬆️
unit	46.97962% <63.63636%> (?)

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[Tanya-Solyanik]

Please investigate if the fix can be moved to the lower level rendering code