When I try to open two images from app, then only in AppImage after opening first, the entire UI froze and I must close this image to be able to open next one.
Binaries to test can be downloaded here - https://github.com/qarmin/czkawka/releases
linux_czkawka_gui - normal binary, needs GTK 3.22+ to be able to run - needs to be opened from command line
linux_czkawka_gui.AppImage - appimage binary, built on Ubuntu 18.04
Instructions which created this appimage - https://github.com/qarmin/czkawka/blob/a047380dbe8aa4d04f9c482364469e21d231fab2/.github/workflows/linux.yml#L250-L258
To reproduce this just create some 2 exactly the same images and scan its directory for duplicates and try open this images by double clicking at them.
Normal binary(correct behavior, I can open multiple files at once)
Appimage - freeze when trying to open two images