[gtk] popover: Drop some dead code

[Matthias Clasen <matthiasc src gnome org>]

commit 443f8ddf6bbb15d4516bf2b5fd2c8b77fa10f840
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Jul 15 08:17:25 2018 -0400

    popover: Drop some dead code
    
    This will be done differently, using xdg-popup instead
    of subsurfaces, so no point in keeping this.

 gtk/gtkpopover.c | 24 +-----------------------
 1 file changed, 1 insertion(+), 23 deletions(-)
---
diff --git a/gtk/gtkpopover.c b/gtk/gtkpopover.c
index 3263f06775..cbfa3c9976 100644
--- a/gtk/gtkpopover.c
+++ b/gtk/gtkpopover.c
@@ -564,29 +564,7 @@ gtk_popover_realize (GtkWidget *widget)
 
   gtk_widget_get_surface_allocation (widget, &allocation);
 
-  /* We want to use subsurfaces for popovers, so they can extend outside
-   * the main window, but for that, we first need to have clean subsurface
-   * support that works with GSK.
-   */
-#if 0
-  if (GDK_IS_WAYLAND_DISPLAY (gtk_widget_get_display (widget)))
-    {
-      GtkWidget *toplevel = gtk_widget_get_toplevel (widget);
-
-      g_assert (GTK_IS_WINDOW (toplevel));
-
-      surface = gdk_wayland_surface_new_subsurface (gtk_widget_get_display (toplevel),
-                                                   &allocation);
-
-      gdk_surface_set_transient_for (surface,
-                                    gtk_widget_get_surface (toplevel));
-    }
-  else
-#endif
-    {
-      surface = gdk_surface_new_child (gtk_widget_get_parent_surface (widget),
-                                      &allocation);
-    }
+  surface = gdk_surface_new_child (gtk_widget_get_parent_surface (widget), &allocation);
 
   gtk_widget_set_surface (widget, surface);
   gtk_widget_register_surface (widget, surface);