Allow folder creation in public share

[labkode]

If you share by public link a folder and you allow public upload/editing then you have a button to upload files but not to create folders.

The only way to create a folder is using drag and drop.

The possibility to create folders in this mode is very useful and should be there, the implementation already allows it, so it is just a matter of UI + Ajax call.

Cheers

[PVince81]

Duplicate of #6635

[PVince81]

It's not as easy as you think. The problem is that ajax calls all work for the logged in user, but are not suitable for the public link.

I already have a working alternative where we use WebDAV and the "publicwebdav" endpoint instead of ajax in the files app, see #12353

[PVince81]

I actually meant the PR matching that ticket: #16902

[labkode]

@PVince81 at least creating folders works without being logged in, you can test it sharing an editable public share and accessing it from another browser/incognito session and try to drag and drop the folder