I've been using GTK3 based gretl for years - without any problems.
Recently, I decided to move from the very old X11 graphics to Wayland
and I encountered the following two problems:
1. Drag-and-drop actions don't work (neither for scripts nor data).
2. Clipboard is one-directional: I can copy raw text from the operating
system to gretl, but I cannot copy enything from gretl to operating
system (scripts, results).
I checked GTK2 and everything is ok. I'm using current git version.