[Accessibility][Win11] The color contrast of the dataGridViewCheckBox cell is less than 3:1

.NET Core Version:

• .NET SDK 7.0.100-preview.2.22108.9

Have you experienced this same bug with .NET Framework?:

• Yes

More Info:

1. This issue can’t reproduce on Windows 10 OS.
2. This issue can reproduce on Windows 11 OS both for Winforms NetFX and Core projects(can reproduce with 3.1, 5.0, 6.0, 7.0).

Problem description: The color contrast less than 3:1 between background color of checkbox and background color of whole cell. For Win11:

Expected behavior: The color contrast should be greater than 3:1 between background color of checkbox and background color of whole cell. For Win10:

Minimal repro:

1. Create a .NET Core Winforms application with DataGridView control added.
2. Add a DataGridViewTextBoxColumn to it.
3. Build and run the project.
4. Check the checkbox, then launch Accessibility Insights for windows tool and observe the color contrast. Or download the attached project, then execute above step 4. CheckBoxCellColorContrast.zip

[Tanya-Solyanik]

@dmitrii-drobotov - a reliable and future-proof fix for this issue required UXTHeme team opening up some APIs for us. Putting this bug on hold until that happens,

[NikitaSemenovAkvelon]

With any of the contrast themes, checkboxes have contrast colors. So, if a user uses a contrast theme, he won’t have any trouble.