(making sure I’m not just doing something wrong before making a (possibly duplicate) bug report)
When I make a rectangular screenshot of a portion of my screen, Klipper doesn’t have any issues letting me paste the resulting image. However, if I make a full-screen-size screenshot (or do a “Capture Entire Desktop“ action), I can’t paste the image, but I can see it appearing in the clipboard history. As a workaround, I can open Klipper (in the system tray or with Meta+V), select any other entry and then back to the screenshot I want to paste, then it pastes it.
I’ve just tried and now it fails with rectangular full-screen-size selection only in 5% of attempts… But with a “Capture Entire Desktop“ action it’s more likely to fail (I’d say 40% of attempts to paste the screenshot fail).
This is not exactly a critical problem, but a very annoying one nevertheless.
I can confirm I’m getting this exactly behavior too, I usually screenshot by screenshotting a region with spectacle and then pasting it to wherever I need, if the image is too big (i assume filesize, not physical dimensions as a large screenshot of a single color is typically fine) then when I try to paste into an image editor like Pinta it tells me the clipboard doesn’t contain and image, even though I can see it in the clipboard history, if I try to immediately re-copy this from the history it won’t work
I can also confirm the workaround that I can select another entry, then go back to the ‘too big’ entry and it will copy and paste from there just fine as if there’s no issue at all
Having this exact same issue too, if I make a screenshot too big, the entry appears in the clipboard manager but doesnt paste, and wont paste unless I click a different entry, and then the image entry.
I tried experimenting a bit, seems like the cutoff from where pasting stops/starts working for me is if the image is more or less than 500KiBs, tho it is not always consistent.
Another thing I noticed is that if you paste a non-pastable image into Dolphin, it says the clipboard is empty, but a pastable image will prompt you for a filename, which is what I expect.
Logs do not say anything interesting either, and CPU time also does not seem related, file size seems to be the issue.
Feb 16 21:02:51 starry systemd[2251]: Starting Spectacle screenshot capture utility...
Feb 16 21:02:51 starry systemd[2251]: Started Spectacle screenshot capture utility.
Feb 16 21:02:55 starry systemd[2251]: app-org.kde.spectacle.service: Consumed 2.867s CPU time.
Feb 16 21:04:04 starry systemd[2251]: Starting Spectacle screenshot capture utility...
Feb 16 21:04:04 starry systemd[2251]: Started Spectacle screenshot capture utility.
Feb 16 21:04:05 starry systemd[2251]: app-org.kde.spectacle.service: Consumed 2.419s CPU time.
Feb 16 21:04:22 starry systemd[2251]: Starting Spectacle screenshot capture utility...
Feb 16 21:04:22 starry systemd[2251]: Started Spectacle screenshot capture utility.
Feb 16 21:04:27 starry systemd[2251]: app-org.kde.spectacle.service: Consumed 4.090s CPU time.