TransientButton: WARN: removeClass was called with an element that doesn't exist

[phloxic]

Description

Expected: player does not try to removeClass after disposal of the TransientButton.
What happens: after disposing the TransientButton, the player still tries to removeClass when you toggle controlbar visibility by hovering.

Reduced test case

https://deploy-preview-8629--videojs-preview.netlify.app/sandbox/transient-button.html

Steps to reproduce

1. Go to demo page, open console
2. Start playback
3. Click transient unmute button
4. Check removeClass was called with an element that doesn't exist warning in console, when controlbar visibility (user activity) is toggled.

Errors

No errors. Just the aforementioned warning.

What version of Video.js are you using?

v8.17.0

Video.js plugins used.

none

What browser(s) including version(s) does this occur with?

presumably in all browsers

What OS(es) and version(s) does this occur with?

presumably in all OSes

[mister-ben]

Thanks for keep us honest. Fix incoming.