Move SizeMetadataProvider to core?

[SystemKeeper]

Is your feature request related to a problem? Please describe.
When available, we are using the size metadata in Talk to correctly adjust the space needed for a file preview, before we download that preview. I was a bit confused, when I did not get size information for a gif file, but this is disabled in the photos app on purpose, because it’s not used for photos usually.

Describe the solution you'd like
I am wondering if it makes sense to move the SizeMetadataProvider (https://github.com/nextcloud/photos/blob/master/lib/Listener/SizeMetadataProvider.php) to server, instead of having it in the photos app, similar to the blurhash generation being in server as well (nextcloud/server#41044)

Describe alternatives you've considered
Either enable gif support in photos (or even just for the size provider) or just live with the fact that we don’t get size metadata for gifs.

[ArtificialOwl]

@artonge ?

[artonge]

Could make sense, I did not expect such use case

[SystemKeeper]

I did not expect such use case

Sorry about that 😂
I think when using the blurhash it makes sense to also know the size of the image, to correctly size the blurhash preview (or at least know orientation of the image)