bug(MatRadioButton): MatRadioButton's text color does not follow the color scheme when in MatMenu

[dang-khoa-tran]

Reproduction

Use StackBlitz to reproduce your issue: https://stackblitz.com/edit/components-issue-cxaoov

Steps to reproduce:

1. Create custom dark theme
2. Create MatMenu
3. Create MatRadioButton in MatMenu

Expected Behavior

What behavior were you expecting to see?

MatRadioButton's text color should be white (or at least light)

Actual Behavior

What behavior did you actually see?

MatRadioButton's text color is black

Environment

• Angular: 9
• CDK/Material: Yes, both
• Browser(s): Brave v1.7.98, Safari 13.1.1
• Operating System (e.g. Windows, macOS, Ubuntu): macOS

Possible fixes

I fixed it for me by creating following mixin

@mixin mat-radio-theme-fix($theme) {
	$foreground: map-get($theme, foreground);

	mat-radio-button {
		color: map-get($foreground, text);
	}
}

[crisbeto]

Will be fixed by #19113.

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