STEPS TO REPRODUCE 1. Download any AppImage file to the Desktopp (example: https://www.x-plane.com/desktop/try-it/) 2. Double-click on the icon on the desktop OBSERVED RESULT Launches the file without asking for confirmation EXPECTED RESULT Should ask for confirmation before executing, like Dolphin does: What do you wish to do with this executable file? ADDITIONAL INFO Furthermore, there's an extra one-time dialog in case the file has no execute permission. This dialog has a different visual design and does not have a checkbox for "Do not ask again".
Can confirm. Seems to affect all executables, not just AppImages.
This was fixed a while ago. Can confirm it's working now.