bug(MatSlider): MatSliderThumb stays active after drag ending

[slivniy]

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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 you start dragging slider MatSliderThumb became active. Sometimes, it doesn't loose active state, when you ending dragging. It stays active even after click outside. Only way to 'release' it - drag it again.

Within this issue dragStart event is fired, but dragEnd not. Variable _isActive of MatSliderThumb stays true. That leads to inconsistence of MatSliderThumb view (it looks as active all time) and makes setting it's value programmatically impossible (if you are trying to set Value from component).

Bug is not stable but can be easily reproduced at official doc examples. Mostly occur, when dragging ends little lower than MatSliderThumb position.

https://github.com/user-attachments/assets/77b99e5e-5bb4-4a47-9442-d7a3fbd5e423

Reproduction

StackBlitz link: https://stackblitz.com/edit/ikftbm?file=src%2Fexample%2Fslider-overview-example.html Steps to reproduce:

1. Drag slider a little
2. Release on bottom side

Expected Behavior

dragEnd should be fired each time when user actually ending it.

Actual Behavior

Sometimes dragEnd event is not fired after actual dragging end.

Environment

• Angular: 18
• CDK/Material: 18
• Browser(s): Chrome
• Operating System (e.g. Windows, macOS, Ubuntu): MacOS