bug(snack-bar): wrong snackbar action color with mat-app-background

[romainmoreau]

Is this a regression?

• Yes, this behavior used to work in the previous version

The previous version in which this bug was not present was

14

Description

Using a dark theme and applying the mat-app-background class on the body like suggested here, the action of a snackbar inherits the color from this class making it barely readable.

Reproduction

https://stackblitz.com/edit/wrong-snackbar-action-color-with-mat-app-background-15?file=src%2Fapp%2Fapp.component.ts

Expected Behavior

https://stackblitz.com/edit/wrong-snackbar-action-color-with-mat-app-background-14?file=src%2Fapp%2Fapp.component.ts

Actual Behavior

https://stackblitz.com/edit/wrong-snackbar-action-color-with-mat-app-background-15?file=src%2Fapp%2Fapp.component.ts

Environment

• Angular: 15.0.3
• CDK/Material: 15.0.2
• Browser(s): Firefox
• Operating System (e.g. Windows, macOS, Ubuntu): Windows

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