bug(mat-button-toggle): mat-button-toggle is 2px too tall

[HMPerson1]

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

A mat-button-toggle is 2px taller than a mat-stroked-button despite both --mat-standard-button-toggle-height and --mdc-outlined-button-container-height both defaulting to 40px.

(this screenshot is at 2x zoom; each grid square is 2px)

Reproduction

StackBlitz link: https://stackblitz.com/edit/components-issue-starter-bqkpddq3?file=src%2Fmain.ts

Expected Behavior

mat-stroked-button and mat-button-toggle have the same height

Actual Behavior

mat-button-toggle is 2px taller than mat-stroked-button

Environment

> ng version

     _                      _                 ____ _     ___
    / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
   / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
  / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
 /_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
                |___/
    

Angular CLI: 18.2.8
Node: 18.20.3
Package Manager: npm 10.2.3
OS: linux x64

Angular: 18.2.8
... animations, cdk, cli, common, compiler, compiler-cli, core
... forms, material, platform-browser, router

Package                         Version
---------------------------------------------------------
@angular-devkit/architect       0.1802.9
@angular-devkit/build-angular   18.2.9
@angular-devkit/core            18.2.9
@angular-devkit/schematics      18.2.8
@schematics/angular             18.2.8
rxjs                            7.8.1
typescript                      5.5.4
zone.js                         0.14.10