layer shell window not shown with this example

[dgod]

Fedora 40 wlroots 0.17.3 labwc 0.7.2 gtk-layer-shell 0.8.2

#include <gtk/gtk.h>
#include <gtk-layer-shell.h>

int main(int argc,char **argv)
{
    gtk_init(&argc,&argv);
    GtkWindow *w = (GtkWindow*)gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_layer_init_for_window(w);
    gtk_layer_set_layer (w, GTK_LAYER_SHELL_LAYER_TOP);
    gtk_layer_set_anchor(w,GTK_LAYER_SHELL_EDGE_LEFT,TRUE);
    gtk_layer_set_anchor(w,GTK_LAYER_SHELL_EDGE_RIGHT,FALSE);
    gtk_layer_set_anchor(w,GTK_LAYER_SHELL_EDGE_TOP,TRUE);
    gtk_layer_set_anchor(w,GTK_LAYER_SHELL_EDGE_BOTTOM,FALSE);

    gtk_window_resize(w,400,400);
    gtk_widget_show_all(GTK_WIDGET(w));
    gtk_main();
    return 0;
}

[wmww]

If the window doesn't have any content (and so is naturally 0-sized) you need to call gtk_widget_set_size_request(), as per the docs.