gtk4: Use GtkBox instead of GtkGrid where applicable
Our gtk-clients use GtkGrid almost everywhere where GtkBox would suffice. Especially with the changes needed for gtk-3.98.4, this makes our code much more complicated than it would need to be.
For gtk4-client I've been doing this for the parts of code I've been touching with other changes.
Our gtk-clients use GtkGrid almost everywhere where GtkBox would suffice. Especially with the changes needed for gtk-3.98.4, this makes our code much more complicated than it would need to be.