Check free space of target folder after drag and drop

[ChristophWurst]

This is a revival of #6508

• I don't know where this add function is called, so I can't change that to be able to work with async operations
• The error handling is most likely not sufficient
• Not sure if the propfind is always necessary or correct. It works for external storage, tho.

@nextcloud/javascript I know this is some of our ugliest code but any help is HIGHLY appreciate 🙏

Fixes#5437

[kesselb]

Looks like fun 😆

[ChristophWurst]

Looks like fun laughing

Thanks for the supportive comment 😉

[juliusknorr]

I just had a quick look, but I'll check it more in detail next week.

I don't know where this add function is called, so I can't change that to be able to work with async operations

It is called by the jquery.fileupload plugin, I'd probably stay away from patching around in that 🙈

Not sure if the propfind is always necessary or correct. It works for external storage, tho.

We could probably just extend the existing profind with the d:quota-available-bytes property so we have the infomation around already in the filelist, but that might have a performance impact, not sure about that right now.

[juliusknorr]

I've pushed my idea of the implementation to #24102

[ChristophWurst]

#24102 works very nicely and is less hacky.