bug(mat-button, mat-icon): mat-icon inside of mat-button are truncated

[lgigrl]

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

Not sure which

Description

Using Angular 19 with angular material, if I put a mat-icon element inside of a mat-button, the icon is not completely visible. It is truncated a little at its top and bottom. See reproduction StackBlitz below.

Reproduction

Forked the "Button Angular Component" example to display the problem.

Editor: https://stackblitz.com/edit/3zsvfedr?file=src%2Fexample%2Fbutton-overview-example.html
Application: https://3zsvfedr.stackblitz.io

See the second button in the "Basic" "Raised" "Stroke" and "Flat" table rows.

Expected Behavior

I would expect the icon to be fully visible, not truncated. In case of the add_circle icon, I would expect its shape to be perfectly round.

Actual Behavior

The top and bottom of the icon are truncated (cropped) which makes it painfully not round.

Environment

• Angular: 19
• CDK/Material: 19.2.7
• Browser(s): Edge, Chrome and Firefox
• Operating System: Windows

[crisbeto]

I couldn't reproduce it from the Stackblitz. Here's what it looks like for me:

[lgigrl]

Even though I feel it shouldn't make a difference, my colleagues on mac do not experience the problem, only those using Windows.

Here's how it looks for us on Windows 10 using either Edge, Chrome or Firefox:

[naaajii]

I am also able to replicate it on Windows ( both 10 & 11 ) on Edge & Chrome, although zooming on buttons fixes the truncated bit.

[KinokoF]

I am also experiencing the issue with Chrome on Windows 11