Issue 11760 fix tool strip combo box display

[LeafShi1]

Fixes #11760

Proposed changes

• When the control is ToolStripComboBox, redraw the control when the mouse hovers. (It's mean that revert the changes of PR Issue 2053861 fix combo box flickering issue #11529 when the ComboBox's dropdown button is using small button)

Customer Impact

• The ToolStripComboBox can be used normally without weird display

Regression?

• Yes

Risk

• Minimal

Screenshots

Before

When hovering over drop-down arrow of ToolStripComboBox, an additional blue hover effect appears outside the icon.

ToolStripComboBox.mp4

After

No additional blue hover effect appears outside the icon.

Test methodology

• Manually

Test environment(s)

• 9.0.0-preview.7.24370.5

Microsoft Reviewers: Open in CodeFlow

[codecov]

Codecov Report

Attention: Patch coverage is 30.00000% with 7 lines in your changes missing coverage. Please review.

Project coverage is 74.83942%. Comparing base (c0318e5) to head (a429cb9).
Report is 26 commits behind head on main.

Additional details and impacted files

@@                 Coverage Diff                 @@
##                main      #11761         +/-   ##
===================================================
+ Coverage   74.73622%   74.83942%   +0.10320%     
===================================================
  Files           3045        3013         -32     
  Lines         630638      629270       -1368     
  Branches       46862       46693        -169     
===================================================
- Hits          471315      470942        -373     
+ Misses        155957      154969        -988     
+ Partials        3366        3359          -7     

Flag	Coverage Δ
Debug	74.83942% <30.00000%> (+0.10320%)	⬆️
integration	18.03225% <0.00000%> (+0.08799%)	⬆️
production	47.83505% <30.00000%> (+0.07712%)	⬆️
test	97.01255% <ø> (+0.02721%)	⬆️
unit	44.83673% <30.00000%> (+0.03185%)	⬆️

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[Tanya-Solyanik]

Thank you!