I previously reported a couple of differences in behaviour between GTK+ with the X11 and Wayland backends. Here's another one. The attached program has an expander which is set to resize the containing top level window. With the Wayland backend the window grows every time the expander is opened or closed. This is on Fedora 25 with GTK+ 3.22.8. Ron
Attachment:
tester3.c
Description: Text document