Drop gtk_widget_set_surface

Not used anymore. Only GtkNative's have surfaces.

docs/reference/gtk/gtk4-sections.txt

@@ -4529,7 +4529,6 @@ gtk_widget_has_visible_focus
 gtk_widget_has_grab
 gtk_widget_is_drawable
 gtk_widget_is_toplevel
-gtk_widget_set_surface
 gtk_widget_set_receives_default
 gtk_widget_get_receives_default
 gtk_widget_set_support_multidevice

gtk/gtkpopover.c

@@ -555,7 +555,6 @@ gtk_popover_realize (GtkWidget *widget)
 
   priv->surface = gdk_surface_new_popup (display, gtk_widget_get_surface (priv->relative_to), priv->modal);
 
-  gtk_widget_set_surface (widget, priv->surface);
   gdk_surface_set_widget (priv->surface, widget);
 
   g_signal_connect_swapped (priv->surface, "notify::state", G_CALLBACK (surface_state_changed), widget);

gtk/gtkwidget.c

@@ -8196,7 +8196,6 @@ gtk_widget_real_realize (GtkWidget *widget)
 
   if (GTK_IS_NATIVE (widget))
     {
-      g_assert (priv->surface != NULL);
       priv->surface = gtk_native_get_surface (GTK_NATIVE (widget));
       g_object_ref (priv->surface);
     }
@@ -11199,38 +11198,6 @@ gtk_widget_get_allocated_baseline (GtkWidget *widget)
   return priv->baseline - margin.top - border.top - padding.top;
 }
 
-/**
- * gtk_widget_set_surface:
- * @widget: a #GtkWidget
- * @surface: (transfer full): a #GdkSurface
- *
- * Sets a widget’s surface. This function should only be used in a
- * widget’s #GtkWidget::realize implementation. The %surface passed is
- * usually either new surface created with gdk_surface_new(), or the
- * surface of its parent widget as returned by
- * gtk_widget_get_parent_surface().
- *
- * Widgets must indicate whether they will create their own #GdkSurface
- * by calling gtk_widget_set_has_surface(). This is usually done in the
- * widget’s init() function.
- *
- * Note that this function does not add any reference to @surface.
- */
-void
-gtk_widget_set_surface (GtkWidget *widget,
-                        GdkSurface *surface)
-{
-  GtkWidgetPrivate *priv = gtk_widget_get_instance_private (widget);
-
-  g_return_if_fail (GTK_IS_WIDGET (widget));
-  g_return_if_fail (surface == NULL || GDK_IS_SURFACE (surface));
-
-  if (priv->surface != surface)
-    {
-      priv->surface = surface;
-    }
-}
-
 /**
  * gtk_widget_get_surface:
  * @widget: a #GtkWidget

gtk/gtkwidget.h

@@ -552,9 +552,6 @@ void                  gtk_widget_set_child_visible      (GtkWidget    *widget,
 GDK_AVAILABLE_IN_ALL
 gboolean              gtk_widget_get_child_visible      (GtkWidget    *widget);
 
-GDK_AVAILABLE_IN_ALL
-void                  gtk_widget_set_surface            (GtkWidget    *widget,
-                                                         GdkSurface    *surface);
 GDK_AVAILABLE_IN_ALL
 GdkSurface           * gtk_widget_get_surface           (GtkWidget    *widget);
 

gtk/gtkwindow.c

@@ -5698,8 +5698,6 @@ gtk_window_realize (GtkWidget *widget)
     }
 
   priv->surface = surface;
-
-  gtk_widget_set_surface (widget, surface);
   gdk_surface_set_widget (surface, widget);
 
   g_signal_connect_swapped (surface, "notify::state", G_CALLBACK (surface_state_changed), widget);