AutoDJ: Reset AutoDJ when deck orientation changes

[ywwg]

When deck orientation changes, disable and then enable AutoDJ in case the program is now in an invalid state.

Fixes #15962

[daschuer]

The off/on cycle does not produce a nice message when changing the orientation of the playing deck.
I think you need to special case that. I suggest to disable the AutoDJ and pop up a message.
"Playing deck orientation changed. Auto DJ disabled."

[ywwg]

in that case I will add the message and then not try to trigger it back on. better to just turn it off and let the DJ figure out what they want to do.

[ywwg]

I can rebase on 2.6 if you like

[ywwg]

"Playing deck orientation changed. Auto DJ disabled."

I'm reusing an existing error message but I can create a new one

[ronso0]

Can the dialog have a button or checkbox to re-enable it?
Or will this actually be a one-time issue only, meaning the DJ will learn quickly that they shouldn't mess with deck orientation when Auto DJ is running?
(didn't test or check the code, just stopping by)

[ywwg]

I am guessing this will be a one-time issue -- in my case I flipped a switch on my controller to change deck orientation and then mixxx crashed. In this case, mixxx would have popped up the box and I would have realized I had to move the switch back.

[ywwg]

@daschuer did you still want a different dialog box?

[github-actions]

This PR is marked as stale because it has been open 90 days with no activity.

[daschuer]

LGTM, Thank you.