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[Accessibility] [HC] The little triangle of "toolbar options" button in ToolStrip is hard to visible when focusing on it #7724

@Olina-Zhang

Description

@Olina-Zhang

.NET version

8.0.100-alpha.1.22451.15

Did it work in .NET Framework?

No

Did it work in any of the earlier releases of .NET Core or .NET 5+?

No, not a regression issue

Issue description

The little triangle of "Toolbar options" button in ToolStrip is hard to visible on Windows 11 high contrast themes and Windows 10 high contrast black/white themes

Windows 11 HC Aquatic/Desert/Dusk/Night Sky testing results:
image

Windows 11 default theme:
image

Windows 10 HC black/white/#1/#2 testing result:
image

Windows 10 default theme:
image

Steps to reproduce

Sample application:
WinFormsApp9.zip

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tenet-accessibilityMAS violation, UIA issue; problems with accessibility standards

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