[dia] Remove nowadays unused display hash table (display_ht)

[Hans Breuer <hans src gnome org>]

commit e85adef977c6b343862d3b21e0e887bb1cf75f0d
Author: Hans Breuer <hans breuer org>
Date:   Sun Oct 17 19:08:12 2010 +0200

    Remove nowadays unused display hash table (display_ht)

 app/display.c |   18 ------------------
 1 files changed, 0 insertions(+), 18 deletions(-)
---
diff --git a/app/display.c b/app/display.c
index c39d42d..d85f0aa 100644
--- a/app/display.c
+++ b/app/display.c
@@ -48,7 +48,6 @@
 #include "diatransform.h"
 #include "recent_files.h"
 
-static GHashTable *display_ht = NULL;
 static GdkCursor *current_cursor = NULL;
 
 GdkCursor *default_cursor = NULL;
@@ -61,8 +60,6 @@ typedef struct _IRectangle {
   int left,right;
 } IRectangle;
 
-static guint display_hash(DDisplay *ddisp);
-
 static void
 update_zoom_status(DDisplay *ddisp)
 {
@@ -198,14 +195,8 @@ initialize_display_widgets(DDisplay *ddisp)
   ddisplay_update_scrollbars(ddisp);
   ddisplay_add_update_all(ddisp);
 
-  if (!display_ht)
-    display_ht = g_hash_table_new ((GHashFunc) display_hash, NULL);
-
   if (!app_is_embedded())
     ddisplay_set_cursor(ddisp, current_cursor);
-  
-  g_hash_table_insert (display_ht, ddisp->shell, ddisp);
-  g_hash_table_insert (display_ht, ddisp->canvas, ddisp);
 
   if (!input_methods_done) {
       im_menu_item = menus_get_action ("InputMethods");
@@ -336,12 +327,6 @@ new_display(Diagram *dia)
   return ddisp;  /*  set the user data  */
 }
 
-static guint
-display_hash(DDisplay *ddisp)
-{
-  return (gulong) ddisp;
-}
-
 void
 ddisplay_transform_coords_double(DDisplay *ddisp,
 				 coord x, coord y,
@@ -1386,9 +1371,6 @@ ddisplay_really_destroy(DDisplay *ddisp)
 
   g_object_unref (ddisp->renderer);
   ddisp->renderer = NULL;
-  
-  g_hash_table_remove(display_ht, ddisp->shell);
-  g_hash_table_remove(display_ht, ddisp->canvas);
 
   /* Free update_areas list: */
   ddisplay_free_update_areas(ddisp);