Some make corrections for HP and related,

Changed refresh order so that window-less widgets
    don't get overdrawn anymore,
  Prevent GTK from filtering our supposedly unneeded
    expose events,
  Block all expose calls if a resize is requested and
    do a full redraw then, thus removing flicker and
    behaving like wxMSW,
  Moved some doubled expose and draw code from GtkPizza
    to the respective callbacks in window.cpp,
  Set idle priority to a higher value (which should
    indicate a lower priority if I interpret glib.h
    correctly) but the desired side-effect didn't
    really show up.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@6533 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/win_gtk.h

@@ -33,9 +33,19 @@ typedef enum
     GTK_MYSHADOW_OUT
 } GtkMyShadowType;
 
+typedef struct _GtkPizzaChild    GtkPizzaChild;
 typedef struct _GtkPizza        GtkPizza;
 typedef struct _GtkPizzaClass   GtkPizzaClass;
 
+struct _GtkPizzaChild
+{
+    GtkWidget *widget;
+    gint x;
+    gint y;
+    gint width;
+    gint height;
+};
+
 struct _GtkPizza
 {
     GtkContainer container;