Fix Form ForeColor overriding DataGridView cell ForeColor

[abineshPalanisamy]

Fixes #11065

Proposed changes

• Update the DataGridView.DefaultCellStyle setter to detect when DefaultCellStyle.ForeColor is explicitly set by the user.
• When a user-defined ForeColor is present, update State1_AmbientForeColor to false.
• Prevent the parent Form.ForeColor from being applied through ambient ForeColor inheritance when the cell style already has an explicit ForeColor.
• Preserve existing ambient behavior when DefaultCellStyle.ForeColor is not explicitly set.

Root cause

• DataGridView.ForeColor is an ambient property and can inherit its value from the parent Form.
• When the parent Form.ForeColor is changed, DataGridView updates the cell style foreground color if State1_AmbientForeColor is set to true.
• In the reported scenario, DefaultCellStyle.ForeColor is explicitly set to Lime, but State1_AmbientForeColor remains true.
• Because of this, when the Form.ForeColor is set to Red, the ambient ForeColor update replaces the user-defined DefaultCellStyle.ForeColor.
• As a result, cells display the Form.ForeColor instead of the explicitly configured DefaultCellStyle.ForeColor.

Customer Impact

• Fixes an issue where Form.ForeColor incorrectly overrides DataGridView.DefaultCellStyle.ForeColor.
• Ensures that when users explicitly configure DefaultCellStyle.ForeColor, that value is preserved.
• Prevents unexpected cell text color changes caused by parent Form.ForeColor updates.
• Improves consistency between the designer-configured DefaultCellStyle.ForeColor and the runtime cell rendering behavior.

Regression?

• No

Risk

• Low.
• The change is limited to the DataGridView.DefaultCellStyle setter.
• Existing ambient ForeColor behavior is preserved when DefaultCellStyle.ForeColor is not explicitly set.
• The change only disables ambient ForeColor inheritance when a user-defined DefaultCellStyle.ForeColor exists.

Screenshots

Before

Forecolor_Before_fix.mp4

After

Forecolor_After_fix.mp4

Test methodology

• Reproduced the issue using a DataGridView with DefaultCellStyle.ForeColor explicitly set to Lime and the parent Form.ForeColor set to Red.
• Verified that before the fix, the cell text color was overridden by the parent Form.ForeColor.
• Verified that after the fix, the user-defined DefaultCellStyle.ForeColor is preserved.
• Added unit test coverage to ensure DefaultCellStyle.ForeColor is not overridden when explicitly set.
• Added regression coverage to ensure ambient ForeColor inheritance still works when DefaultCellStyle.ForeColor is not explicitly set.
• Verified that related properties such as Font and BackColor continue to work as expected.
• Reviewed and executed existing DataGridView unit tests to ensure no regressions were introduced.

Accessibility testing

Test environment(s)

• 11.0.100-preview.3.26170.106

Microsoft Reviewers: Open in CodeFlow

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