plug-ins: move the expose handler to map-pbject-preview.c

plug-ins/map-object/map-object-ui.c

@@ -299,10 +299,6 @@ preview_events (GtkWidget *area,
 
   switch (event->type)
     {
-      case GDK_EXPOSE:
-        draw_preview_image ();
-        break;
-
       case GDK_ENTER_NOTIFY:
         break;
 
@@ -1319,6 +1315,10 @@ main_dialog (GimpDrawable *drawable)
                     G_CALLBACK (preview_events),
                     previewarea);
 
+  g_signal_connect (previewarea, "expose-event",
+                    G_CALLBACK (preview_expose),
+                    previewarea);
+
   hbox = gtk_hbox_new (FALSE, 6);
   gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
   gtk_widget_show (hbox);