Distinguish between local and non-local files with thumbnails

[tsujan]

libfm-qt has an option to make thumbnails only for local files but that option has no effect for now (pcmanfm-qt inherits it in its Preferences dialog).

[stefonarch]

It works here with samba, showing or not thumbnails on the other PC following setting in PCMan, maybe I miss something.

[tsujan]

@stefonarch, the code does absolutely nothing.

[tsujan]

Here, the problem is distinguishing between local and remote files. A native file may be remote (like a file in Google drive, mounted locally by rclone) and a non-native file can be local (like trash:///).

I tested by adding GLib's G_FILE_ATTRIBUTE_FILESYSTEM_REMOTE to libfm-qt (in 2 ways). It worked with trash (= local), smb (= remote) and sftp (= remote) but not with Google drive (should be remote but is considered local) and, probably, similar cases.

There's another GLib's attribute G_FILE_ATTRIBUTE_FILESYSTEM_USE_PREVIEW but it's mysterious to me and I didn't find it in the codes of well-known GTK file managers.

[tsujan]

I think the safest way of giving sense to that option is tolerantly considering "local" as "native". There is a good reason: most external thumbnailers — if not all — only work with native paths and, for example, can't make thumbnails inside trash:/// or recent:/// (while the built-in thumbnailer can). In this way, we'll have a more self-consistent thumbnail handling.

EDIT: Tested it but didn't like it. The above-mentioned reason seems good but, for example, having thumbnails with google drive isn't good.