bug(mat-button): Can't apply theme for FAB and Mini-FAB buttons

[jakubkirylo]

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

No response

Description

When defining theme it's possible to apply it to all components like:
@include mat.all-component-themes($theme);
But it was also possible to apply it to only specific components like:
@include mat.button-theme($theme);

However, the theme gets applied to buttons but not FAB and Mini FAB buttons.

Reproduction

Steps to reproduce:

1. Apply theme to mat-button component only

Forked official example:
https://stackblitz.com/edit/angular-adcpb4?file=src/theme.scss

Expected Behavior

Theme is applied to all buttons, including FAB and Mini-FAB.

Actual Behavior

Theme is not applied to FAB and Mini-FAB

Environment

• Angular: 15.2.6
• CDK/Material: 15.2.6
• Browser(s): Chromium 112.0.5615.49
• Operating System (e.g. Windows, macOS, Ubuntu): Windows

[jakubkirylo]

Ok, solved - it turned out that FAB and mini-FAB has different component selector:
@include mat.fab-theme($theme);

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