bug: launching twice with stdin ignores second launch stdin

[aecsocket]

When launching Gradia with a file from stdin like cat file.png | gradia (or flatpak run be.alexandervanhee.gradia), the first invocation will work fine and the window opens as normal; a second invocation (if the first is still running) will open a new window but without the second input file.

If all instances are closed, and a new one is opened, then it works fine again. This makes me think it's an issue with GTK applications' one-application-only/unique app semantics.

2026-06-29.22-46-52.mp4