[fltk/fltk] [Wayland, libdecor] Wrong size of maximized window with hidden titlebar (Issue #474)

[fltk/fltk] [Wayland, libdecor] Wrong size of maximized window with hidden titlebar (Issue #474) polter Jul 28, 2022

GTK3 allows CSS customizations, headerbar as well. It could be hidden, e.g. for maximized windows (~/.config/gtk-3.0/gtk.css):

.maximized .titlebar.default-decoration {
  margin: -200px 0 0;
  opacity: 0;
}

This approach is used by different GNOME-shell extensions, such as unite or pixel-saver to hide decorations for maximized windows.

Issue is that with this CSS setting, maximized FLTK window on Wayland will have gap at the bottom:

On X11 it is handled correctly:

How to reproduce: put the CSS lines above to ~/.config/gtk-3.0/gtk.css, run any FLTK example and try to maximize it.

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