Workaround for welcome dialog partly out of screen on Wayland
On Wayland, the lower buttons of the Welcome screen are outside of the screen boundaries if the screen is not very high. This is very confusing to new users because the only visible button is "X" which closes the window and exits Inkscape. Especially for 1.4.x I think that it is important to have this or some other workaround (or remove the splash screen again).
The technical reason is that Gtk4 does not re-center a modal dialog when it changes size. As a workaround, make the splash screen approximately as high as the welcome dialog.
A long-term solution would require a redesign of the dialog to always have constant size or an upstream fix in Gtk4.
Before:
After:
Run on Ubuntu 24.04 or 24.10 with GDK_BACKEND=wayland to enforce Wayland.