Files list needs to be sortable

[LukasHirt]

Description

User needs to be allowed to sort the files list. Either having clickable header rows which would sort it or have somewhere a sort by drop (maybe better since on mobile view we hide almost every header row)

[PVince81]

In the current design I was expecting to find it under the filter icon on the top right.

[PVince81]

even if we don't provide an option yet, at least I think we should properly sort it to have the folders on top, instead of this:

[PVince81]

This is the client side JS sorters from the old UI: https://github.com/owncloud/core/blob/master/apps/files/js/filelist.js#L3065

[PVince81]

Draft (broken) PR for default sort: #1972

[LukasHirt]

I think it would be nice to have as well some advanced sort options in the future e. g. "Shared items first" or "Favourite items first".

[PVince81]

Nice idea.

We need to be careful to not overwhelm the user with too many options. We should think about the common use cases and provide a few sorting options for that.

Last time I asked you where to put the sort options and we agreed on using a dropdown instead of clickable columns. This aligns with the idea of providing sort options that do not match specific columns.

[PVince81]

PR here: #3078