Image preview not working

As soon as another image is selected, the icon goes away and the setting gets unchecked.

That sounds very weird. Which version of thunar do you run ? Check help --> about.

Recently there was a major refactoring of thunar thumbnailing in general, including the image preview ... so whatever it is, there are good chances that it got fixed in the dev releases meanwhile (thunar 4.19.1 and above).

added 3. Need Info 5. Image Preview 5. Thumbnails labels

I'm on 4.18.10. That's what in nixos unstable right now.

Uh, you are right, there seems to be some ongoing weirdness with the Image Preview checkbox. Even on master, it will only appear checked, if there actually is a preview for the selected file ... I'll look into it.

Besides that, there is no special dependency for image preview to work. It uses tumbler to request xx-large thumbnails and shows them there.

You can check the folder ~/.cache/thumbnails (might be located somewhere else on NixOS). There should be a subfolder xx-large to which tumbler writes the preview images which are used by thunar. Does that folder exist ? (Is it re-generated when you delete it and enable image preview again + select some image?)

mentioned in commit 7c808314

mentioned in commit 830280d5

changed milestone to %4.18.11

Fixed the checkbox weirdness for 4.18 branch and master ... see commits above.

Just did some testing. There were three subdirs in ~/.cache/thumbnails, fail, large, normal.

When I deleted them, enabled image preview and selected an image I got the same icon. Only normal was recreated. I tried to copy the normal directory to xx-large for testing but it looks like the names are hashed so I'm assuming that's why that didn't work.

I tried to copy the normal directory to xx-large for testing but it looks like the names are hashed so I'm assuming that's why that didn't work.

Yea, that probably won't work .. I don't exactly remember if something else besides the file-path is hashed.

Hmm, so the question now is, does thunar refuse to request the thumbnails? Or does tumbler refuse to generate them? You can listen to the tumbler dbus service like this:

dbus-monitor "interface='org.freedesktop.thumbnails.Thumbnailer1'"

Then enable image preview in thunar and click on some image … if thunar sends a request, this should show some activity on the DBus for that file (request for the preview thumbnail).

Seems like thunar isn't making a request for the xx-large thumbs? This was the output of a dir with 2 images in with no .cache\thumbnails dir upon entering.

signal time=1705947056.391104 sender=org.freedesktop.DBus -> destination=:1.38 serial=2 path=/org/freedesktop/DBus; interface=org.freedesktop.DBus; member=NameAcquired
   string ":1.38"
signal time=1705947056.391138 sender=org.freedesktop.DBus -> destination=:1.38 serial=4 path=/org/freedesktop/DBus; interface=org.freedesktop.DBus; member=NameLost
   string ":1.38"
method call time=1705947062.794994 sender=:1.39 -> destination=:1.35 serial=107 path=/org/freedesktop/thumbnails/Thumbnailer1; interface=org.freedesktop.thumbnails.Thumbnailer1; member=GetSupported
method call time=1705947069.282464 sender=:1.39 -> destination=:1.35 serial=164 path=/org/freedesktop/thumbnails/Thumbnailer1; interface=org.freedesktop.thumbnails.Thumbnailer1; member=Queue
   array [
      string "file:///home/nick/codebase/stable-diffusion-webui/outputs/img2img-images/2024-01-22/00000-2484319713.png"
      string "file:///home/nick/codebase/stable-diffusion-webui/outputs/img2img-images/2024-01-22/00001-2040776847.png"
   ]
   array [
      string "image/png"
      string "image/png"
   ]
   string "normal"
   string "foreground"
   uint32 0
signal time=1705947069.286223 sender=:1.35 -> destination=:1.39 serial=134 path=/org/freedesktop/thumbnails/Thumbnailer1; interface=org.freedesktop.thumbnails.Thumbnailer1; member=Started
   uint32 4
signal time=1705947069.332973 sender=:1.35 -> destination=:1.39 serial=135 path=/org/freedesktop/thumbnails/Thumbnailer1; interface=org.freedesktop.thumbnails.Thumbnailer1; member=Ready
   uint32 4
   array [
      string "file:///home/nick/codebase/stable-diffusion-webui/outputs/img2img-images/2024-01-22/00000-2484319713.png"
   ]
signal time=1705947069.364693 sender=:1.35 -> destination=:1.39 serial=136 path=/org/freedesktop/thumbnails/Thumbnailer1; interface=org.freedesktop.thumbnails.Thumbnailer1; member=Ready
   uint32 4
   array [
      string "file:///home/nick/codebase/stable-diffusion-webui/outputs/img2img-images/2024-01-22/00001-2040776847.png"
   ]
signal time=1705947069.364718 sender=:1.35 -> destination=:1.39 serial=137 path=/org/freedesktop/thumbnails/Thumbnailer1; interface=org.freedesktop.thumbnails.Thumbnailer1; member=Finished
   uint32 4

I figured it out. Thanks @alexxcons! I needed to install xfconf. Thumbnails are working perfectly now.

Glad to hear so! Uff, that comes by surprise ... xfconf actually is a non-optional requirement of thunar, listed as such in https://gitlab.xfce.org/xfce/thunar/-/blob/master/configure.ac?ref_type=heads#L167 ... I am actually surprised to hear that thunar runs at all without having xfconf installed.

Installing thunar, should automatically install xfconf and uninstalling xfconf should as well uninstall thunar (and a bunch of other packages) ... that's how it works for e.g. debian, and imo that makes alot of sense.

Please report that missing dependency to the NixOS folks to prevent others falling into that trap.

Here is the downstream issue for reference

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Image preview not working

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