Thunar does not implement the "shared thumbnails" feature of thumbnail spec

Submitted by Michael Wyraz

Assigned to Xfce Bug Triage

The freedesktop thumbnail spec described how to store and retreive thumbnails. Thunar impements only part of the spec. The "shared thumbnail folder" part described in https://specifications.freedesktop.org/thumbnail-spec/latest/x329.html is entirely missing.

To implement the spec fully, the following things needs to be changed:

thunar needs to check .sh_thumbnails and display thumbnails there before requesting new thumbanils to be created by tumbler
tubler needs only to create tumbnails if they are not already in .sh_thumbnails
for remote drive, thumbnails should also be displayed if they are in .sh_thumbnails, even if thumbanils for remote drives are disabled.

How to test:

delete ~/.cache/thumbnails
on a remote drive, create shared thumbnails (e.g. using https://github.com/jesjimher/genthumbs/blob/master/genthumbs.sh).
on thunar browse the folder with remote thumbnails enabled
verify that thumbnails are shown
verify that ~/.cache/thumbnails remains empty.

Version: 1.6.12