Fix editor crash when re-importing GLTF while animation is playing

[jsjtxietian]

Fixes #82962

This might not be a good solution as it stops the animation everytime edit is called.
Do we have a way to distinguish between normal edit and edit caused by resource re-import? I would appreciate any feedback or alternative suggestions.

[TokageItLab]

I think this is not good way because it will affect even the cases that have nothing related to the reimport.

I suggest that get the singleton of PlayerEditor in importer or somewhere and call the function which stop the player only when a reimport occurs. However, I wonder if stop() is really necessary; just regenerating the cache with clear_caches() may be sufficient. Well, it should not be done in edit() anyway.

[jsjtxietian]

I suggest that get the singleton of PlayerEditor in importer or somewhere and call the function which stop the player only when a reimport occurs. However, I wonder if stop() is really necessary; just regenerating the cache with clear_caches() may be sufficient. Well, it should not be done in edit() anyway.

Thanks! I did not realize there is a singleton of PlayerEditor！

[jsjtxietian]

However, I wonder if stop() is really necessary; just regenerating the cache with clear_caches() may be sufficient.

IMHO it's fine to stop it, as let the animation playing while reimporting is a very rare case and it's not unintuitive to see the animation stopped when re-imported.

[TokageItLab]

Considering multithreading, it may be fine to stop before re-importing as just you have written.

Ideally, it would be better to resume playback if the animation has not changed after re-import, but given that this is editor-only, it is probably not worth it.

[akien-mga]

Thanks!