[libshumate] Add padding to public class structs

[Corentin Noël <corentinnoel src gnome org>]

commit b189bb7685637b0650f8b6a738252c1637dbbc07
Author: James Westman <james jwestman net>
Date:   Fri Jul 29 21:10:57 2022 -0500

    Add padding to public class structs

 shumate/shumate-coordinate.h  | 3 +++
 shumate/shumate-data-source.h | 3 +++
 shumate/shumate-layer.h       | 3 +++
 shumate/shumate-map-source.h  | 3 +++
 shumate/shumate-marker.h      | 3 +++
 5 files changed, 15 insertions(+)
---
diff --git a/shumate/shumate-coordinate.h b/shumate/shumate-coordinate.h
index b8d3222..98b982c 100644
--- a/shumate/shumate-coordinate.h
+++ b/shumate/shumate-coordinate.h
@@ -36,6 +36,9 @@ G_DECLARE_DERIVABLE_TYPE (ShumateCoordinate, shumate_coordinate, SHUMATE, COORDI
 struct _ShumateCoordinateClass
 {
   GInitiallyUnownedClass parent_class;
+
+  /*< private >*/
+  gpointer padding[16];
 };
 
 ShumateCoordinate *shumate_coordinate_new (void);
diff --git a/shumate/shumate-data-source.h b/shumate/shumate-data-source.h
index f6540e3..724a614 100644
--- a/shumate/shumate-data-source.h
+++ b/shumate/shumate-data-source.h
@@ -40,6 +40,9 @@ struct _ShumateDataSourceClass
   GBytes *(*get_tile_data_finish) (ShumateDataSource  *self,
                                    GAsyncResult       *result,
                                    GError            **error);
+
+  /*< private >*/
+  gpointer padding[16];
 };
 
 
diff --git a/shumate/shumate-layer.h b/shumate/shumate-layer.h
index ff699e6..40e2f75 100644
--- a/shumate/shumate-layer.h
+++ b/shumate/shumate-layer.h
@@ -35,6 +35,9 @@ G_DECLARE_DERIVABLE_TYPE (ShumateLayer, shumate_layer, SHUMATE, LAYER, GtkWidget
 struct _ShumateLayerClass
 {
   GtkWidgetClass parent_class;
+
+  /*< private >*/
+  gpointer padding[16];
 };
 
 ShumateViewport *shumate_layer_get_viewport (ShumateLayer *self);
diff --git a/shumate/shumate-map-source.h b/shumate/shumate-map-source.h
index 4046e9c..9e29505 100644
--- a/shumate/shumate-map-source.h
+++ b/shumate/shumate-map-source.h
@@ -54,6 +54,9 @@ struct _ShumateMapSourceClass
   gboolean (*fill_tile_finish) (ShumateMapSource  *self,
                                 GAsyncResult      *result,
                                 GError           **error);
+
+  /*< private >*/
+  gpointer padding[16];
 };
 
 const char *shumate_map_source_get_id (ShumateMapSource *map_source);
diff --git a/shumate/shumate-marker.h b/shumate/shumate-marker.h
index 74348c3..3866930 100644
--- a/shumate/shumate-marker.h
+++ b/shumate/shumate-marker.h
@@ -39,6 +39,9 @@ G_DECLARE_DERIVABLE_TYPE (ShumateMarker, shumate_marker, SHUMATE, MARKER, GtkWid
 struct _ShumateMarkerClass
 {
   GtkWidgetClass parent_class;
+
+  /*< private >*/
+  gpointer padding[16];
 };
 
 ShumateMarker *shumate_marker_new (void);