gtk: add missing class padding

Sorry for this late ABI break, but the newly added style classes
definitely need padding, so I can just as well add missing padding
globally.

gtk/gtkalignment.h

@@ -60,6 +60,12 @@ struct _GtkAlignment
 struct _GtkAlignmentClass
 {
   GtkBinClass parent_class;
+
+  /* Padding for future expansion */
+  void (*_gtk_reserved1) (void);
+  void (*_gtk_reserved2) (void);
+  void (*_gtk_reserved3) (void);
+  void (*_gtk_reserved4) (void);
 };
 
 

gtk/gtkapplication.h

@@ -56,7 +56,7 @@ struct _GtkApplicationClass
   GApplicationClass parent_class;
 
   /*< private >*/
-  gpointer padding[12];
+  gpointer padding[16];
 };
 
 GType                   gtk_application_get_type                        (void) G_GNUC_CONST;

gtk/gtkarrow.h

@@ -60,6 +60,12 @@ struct _GtkArrow
 struct _GtkArrowClass
 {
   GtkMiscClass parent_class;
+
+  /* Padding for future expansion */
+  void (*_gtk_reserved1) (void);
+  void (*_gtk_reserved2) (void);
+  void (*_gtk_reserved3) (void);
+  void (*_gtk_reserved4) (void);
 };
 
 

gtk/gtkaspectframe.h

@@ -59,6 +59,12 @@ struct _GtkAspectFrame
 struct _GtkAspectFrameClass
 {
   GtkFrameClass parent_class;
+
+  /* Padding for future expansion */
+  void (*_gtk_reserved1) (void);
+  void (*_gtk_reserved2) (void);
+  void (*_gtk_reserved3) (void);
+  void (*_gtk_reserved4) (void);
 };
 
 

gtk/gtkbbox.h

@@ -59,6 +59,12 @@ struct _GtkButtonBox
 struct _GtkButtonBoxClass
 {
   GtkBoxClass parent_class;
+
+  /* Padding for future expansion */
+  void (*_gtk_reserved1) (void);
+  void (*_gtk_reserved2) (void);
+  void (*_gtk_reserved3) (void);
+  void (*_gtk_reserved4) (void);
 };
 
 

gtk/gtkbin.h

@@ -60,6 +60,12 @@ struct _GtkBin
 struct _GtkBinClass
 {
   GtkContainerClass parent_class;
+
+  /* Padding for future expansion */
+  void (*_gtk_reserved1) (void);
+  void (*_gtk_reserved2) (void);
+  void (*_gtk_reserved3) (void);
+  void (*_gtk_reserved4) (void);
 };
 
 

gtk/gtkcssprovider.h

@@ -52,6 +52,12 @@ struct _GtkCssProvider
 struct _GtkCssProviderClass
 {
   GObjectClass parent_class;
+
+  /* Padding for future expansion */
+  void (*_gtk_reserved1) (void);
+  void (*_gtk_reserved2) (void);
+  void (*_gtk_reserved3) (void);
+  void (*_gtk_reserved4) (void);
 };
 
 GType gtk_css_provider_get_type (void) G_GNUC_CONST;

gtk/gtkfixed.h

@@ -60,6 +60,12 @@ struct _GtkFixed
 struct _GtkFixedClass
 {
   GtkContainerClass parent_class;
+
+  /* Padding for future expansion */
+  void (*_gtk_reserved1) (void);
+  void (*_gtk_reserved2) (void);
+  void (*_gtk_reserved3) (void);
+  void (*_gtk_reserved4) (void);
 };
 
 struct _GtkFixedChild

gtk/gtkicontheme.h

@@ -58,6 +58,12 @@ struct _GtkIconThemeClass
   GObjectClass parent_class;
 
   void (* changed)  (GtkIconTheme *icon_theme);
+
+  /* Padding for future expansion */
+  void (*_gtk_reserved1) (void);
+  void (*_gtk_reserved2) (void);
+  void (*_gtk_reserved3) (void);
+  void (*_gtk_reserved4) (void);
 };
 
 /**

gtk/gtkmisc.h

@@ -60,6 +60,12 @@ struct _GtkMisc
 struct _GtkMiscClass
 {
   GtkWidgetClass parent_class;
+
+  /* Padding for future expansion */
+  void (*_gtk_reserved1) (void);
+  void (*_gtk_reserved2) (void);
+  void (*_gtk_reserved3) (void);
+  void (*_gtk_reserved4) (void);
 };
 
 

gtk/gtkmodifierstyle.h

@@ -45,6 +45,12 @@ struct _GtkModifierStyle
 struct _GtkModifierStyleClass
 {
   GObjectClass parent_class;
+
+  /* Padding for future expansion */
+  void (*_gtk_reserved1) (void);
+  void (*_gtk_reserved2) (void);
+  void (*_gtk_reserved3) (void);
+  void (*_gtk_reserved4) (void);
 };
 
 GType gtk_modifier_style_get_type (void) G_GNUC_CONST;

gtk/gtknumerableicon.h

@@ -55,7 +55,7 @@ struct _GtkNumerableIconClass {
   GEmblemedIconClass parent_class;
 
   /* padding for future class expansion */
-  gpointer padding[8];
+  gpointer padding[16];
 };
 
 GType             gtk_numerable_icon_get_type                 (void) G_GNUC_CONST;

gtk/gtkstatusicon.h

@@ -75,6 +75,8 @@ struct _GtkStatusIconClass
 
   void (*__gtk_reserved1);
   void (*__gtk_reserved2);
+  void (*__gtk_reserved3);
+  void (*__gtk_reserved4);
 };
 
 GType                 gtk_status_icon_get_type           (void) G_GNUC_CONST;

gtk/gtkstylecontext.h

@@ -52,6 +52,12 @@ struct _GtkStyleContextClass
   GObjectClass parent_class;
 
   void (* changed) (GtkStyleContext *context);
+
+  /* Padding for future expansion */
+  void (*_gtk_reserved1) (void);
+  void (*_gtk_reserved2) (void);
+  void (*_gtk_reserved3) (void);
+  void (*_gtk_reserved4) (void);
 };
 
 /* Default set of properties that GtkStyleContext may contain */

gtk/gtkstyleproperties.h

@@ -52,6 +52,12 @@ struct _GtkStyleProperties
 struct _GtkStylePropertiesClass
 {
   GObjectClass parent_class;
+
+  /* Padding for future expansion */
+  void (*_gtk_reserved1) (void);
+  void (*_gtk_reserved2) (void);
+  void (*_gtk_reserved3) (void);
+  void (*_gtk_reserved4) (void);
 };
 
 typedef gboolean (* GtkStylePropertyParser) (const gchar  *string,