[gtk] range: Use standard padding

[Matthias Clasen <matthiasc src gnome org>]

commit a2d2c8afc4509967e53dc5a840735e83876cada1
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun May 26 23:18:38 2019 -0400

    range: Use standard padding

 gtk/gtkrange.c | 1 +
 gtk/gtkrange.h | 8 +++-----
 2 files changed, 4 insertions(+), 5 deletions(-)
---
diff --git a/gtk/gtkrange.c b/gtk/gtkrange.c
index 06a0559b47..55ad3c37ee 100644
--- a/gtk/gtkrange.c
+++ b/gtk/gtkrange.c
@@ -69,6 +69,7 @@
 
 typedef struct _GtkRangeStepTimer GtkRangeStepTimer;
 
+typedef struct _GtkRangePrivate       GtkRangePrivate;
 struct _GtkRangePrivate
 {
   GtkWidget *grab_location;   /* "grabbed" mouse location, NULL for no grab */
diff --git a/gtk/gtkrange.h b/gtk/gtkrange.h
index 60787e195a..13136cadde 100644
--- a/gtk/gtkrange.h
+++ b/gtk/gtkrange.h
@@ -44,7 +44,6 @@ G_BEGIN_DECLS
 #define GTK_RANGE_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_RANGE, GtkRangeClass))
 
 typedef struct _GtkRange              GtkRange;
-typedef struct _GtkRangePrivate       GtkRangePrivate;
 typedef struct _GtkRangeClass         GtkRangeClass;
 
 struct _GtkRange
@@ -77,10 +76,9 @@ struct _GtkRangeClass
                                     gint           *minimum,
                                     gint           *natural);
 
-  /* Padding for future expansion */
-  void (*_gtk_reserved1) (void);
-  void (*_gtk_reserved2) (void);
-  void (*_gtk_reserved3) (void);
+  /*< private > */
+
+  gpointer padding[8];
 };