Image file disappears after modification when created from template, displaying an endless «Loading...»

[SebastJava]

 * Nemo version: 4.8.6
 * Issue with windowed nemo
 * Distribution: Linux Mint 20.1 Ulyssa
 * Graphics:  Device-1: Intel 2nd Generation Core Processor Family Integrated Graphics driver: i915 v: kernel 
           Display: x11 server: X.Org 1.20.9 driver: modesetting unloaded: fbdev,vesa resolution: 1920x1080~60Hz 
           OpenGL: renderer: Mesa DRI Intel HD Graphics 2000 (SNB GT1) v: 3.3 Mesa 20.2.6
 * 64 bit

Issue
Image file disappears after modification if image was created from template

Steps to reproduce

• Have thumbnails enabled
• Create any SVG or PNG file, with any software, and save it into ~/Templates/ directory
• Create a ~/Test/ directory
• Right-click in your ~/Test/ directory to Create New Document > file-from-template
• Change directory to parent, so ~/Test/file-from-template is not visible but without closing Nemo.
• Open ~/Test/file-from-template from any software, do some change, and save it. (1)
• Open ~/Test/ directory: file-from-template disappeared, displaying an endless «Loading...»

Expected behaviour
I would like to be able to edit images without worrying about them disappearing.

Other information
Sorry to bother you again. There are lots of similar issues with thumbnails.

• I am trying to narrow down the problem, so, all my plugins were disabled.
• I also had similar issues with thumbnails on Caja, on Mint MATE 18.3 32-bit.

---

1. You could also have opened this file-from-template from Nemo itself, but before you save and before you move up to parent directory, of course.

[SebastJava]

Other information (bis)

• View > Show Thumbnails: on/off is overridden by Edit > Preferences > Preview... Show thumbnails
• I have a feeling that sometimes creating the thumbnails takes double the time. But this is just a feeling

[leigh123linux]

I'm going to unsubscribe due to your comment spam.

[SebastJava]

@mtwebster Did you see this? Sorry to bother you again but you worked on a similar issue not long ago.

[Jeremy7701]

But note that Edit > Preferences > Preview... also includes an option of "Inherit thumbnail visibility from parent".
Once nemo has created a thumbnail, it tends to keep it - switching off thumbnailing supplies a default icon.

Personally, since I mostly use the icon view, I have all thumbnail preferences set as permanently 'yes' - including having the toolbar icon that allows switching on thumbnails on/off permanently set to 'on'.

[SebastJava]

@Jeremy7701 These are my current settings in Nemo preferences. And i removed the toolbar icon for thumbnails on/off because i never toggle this off. Re-checked in Nemo > View > Show Thumbnails: ON.

I don't think i changed these settings lately, but, just in case, i will re-test these "steps to reproduce"... RE-TESTED! I still get this same bug. And ALL the Plugins > Actions and Extensions are currently Disabled.

[SebastJava]

@Jeremy7701 Can you reproduce this issue?

[Jeremy7701]

I can't reproduce your fault - the "view" option takes precedence over the "preferences" option, as it should. I've have most off the addons loaded. My settings are

BTW I've got a new PC, so I've got a completely fresh install of LMDE4, only about 4 months old. Have you tried loading Mint/LMDE as a VM (so that you get a completely fresh install)?
Have to say, I think this kind of bug would have been spotted before now, if it were widespread.

[SebastJava]

@Jeremy7701 I still have to look at your exact preferences, and think about it, and try it. But there's 1 or 2 things i want to give a quick response to...

1. I experienced those similar issues on a fresh LM Cinnamon 20 install. At the time we did all those tests, it was still approximately fresh. But, okay, i did some "hazardous experiments" during this SVG and PNG files "disappears" after editing a copy of it. Endless "Loading" cycling indicator is displayed... #2623 investigation. VM? I never tried that, don't know how to, and it would probably be slow on my old Dell Optiplex 790 (i5). But, hey, i still have this LM 20 USB key installer. That's like totally new! I will test on this, soon.
2. Not widespread!? I think it is widespread. And old. I also experienced this similar issue SVG and PNG files "disappears" after editing a copy of it. Endless "Loading" cycling indicator is displayed... #2623, long ago, on my netbook with LM MATE 18.3. That's with the Caja file manager. And... Because it recently reached EoL, i just did a complete fresh install of LM MATE 19.3, just a few days ago, on this little netbook. I will do the test on this too.

Oh, i see you were just talking about this

"view" option takes precedence over the "preferences" option

but did you get this issue, as described in the Steps to reproduce, on top of this page? Remember, please follow exactly each steps, including this key step:

Change directory to parent, so ~/Test/file-from-template is not visible but without closing Nemo.

I still have to do those double and triple checks on my USB bootable key with LM Cinnamon 20 and also this fresh LM MATE 19.3. But i am pretty sure i will get this same bug. Stay tuned!

P.S.: If you really can't reproduce this issue, then i may have to narrow it down to what software to use, what kind of image, etc.
P.S.: You are on LMDE4. If you have a lot of spare time, it would be appreciated if you could try this on the exact same system as me: LinuxMint Cinnamon 20.1 64-bit...

[Jeremy7701]

I didn't appreciate the significance of the template and then opening the file outside nemo.
So yes - I can reproduce the original issue, I'm not sure that the view option is relevant, though.

Furthermore, most templates such as writer/Calc/text don't have a file-dependant thumbnails - actually, if I was creating an image or video, I wouldn't find the template option to be especially useful as it only provides a single file per user.
Why not create a single "template-file" in your working directory and use edit + save-as to create multiple copies?

This works, provided you launch inkscape from nemo; all the different thumbnails are created.

[SebastJava]

@Jeremy7701

I didn't appreciate the significance of the template and then opening the file outside Nemo.

You could also have opened this file-from-template from Nemo itself, but before you save and before you move up to parent directory, of course. See my edited Steps to reproduce here on top. ▲

So yes - I can reproduce the original issue

Ah. So i am not crazy. Guess I'm exempt from having to install a brand new system? I could also have restarted on this USB key, but that's much less relevant because that way I wouldn't have the very latest version of Nemo.

I wouldn't find the template option to be especially useful as it only provides a single file per user.

I can very well imagine several situations where the templates+thumbnails would be very relevant.

Example: I create a newsletter in Inkscape. That makes 8 to 16 pages, and it is published every month. One of the basic rules for good design is repetition: pages 2 to 16 must share some common elements such as a unique logo, a unique page numbering, plus some top and bottom page lines and layouts, etc. So, it would really make sense to start creating every page from a common template. And that's 16 page X 12 months = 192 pages created neatly and easily.

And on top of all that, i am not sure this bug only occurs with Templates... But I avoid creating new issues unless i can give precise instructions on how to consistently reproduce the issue, every time, after having it tested and retested.

Hey, this looks great. I am writing this long post here, and this JavaScript or whatever state-of-the-art dynamic web page got this red symbol added along with this text: "mtwebster closed this in 73aafd8 22 minutes ago". So, that's it. Hopefully. I can't wait to see this new Nemo version... And test it again. :)