This fixes a problem of overaggressively grouping windows in the
tasklist with our default size 24 panel.  See bnc #148840 for
details and a screenshot.

Index: libwnck/tasklist.c
===================================================================
RCS file: /cvs/gnome/libwnck/libwnck/tasklist.c,v
retrieving revision 1.87
diff -u -p -u -r1.87 tasklist.c
--- libwnck/tasklist.c	3 Oct 2005 19:42:46 -0000	1.87
+++ libwnck/tasklist.c	26 Apr 2006 21:45:51 -0000
@@ -185,6 +185,9 @@ struct _WnckTasklistPrivate
   gint minimum_width;
   gint minimum_height;
 
+  gint last_width;
+  gint last_height;
+
   WnckLoadIconFunction icon_loader;
   void *icon_loader_data;
   GDestroyNotify free_icon_loader_data;
@@ -694,6 +697,9 @@ wnck_tasklist_init (WnckTasklist *taskli
   tasklist->priv->minimum_width = DEFAULT_WIDTH;
   tasklist->priv->minimum_height = DEFAULT_HEIGHT;
 
+  tasklist->priv->last_width = -1;
+  tasklist->priv->last_height = -1;
+
   tasklist->priv->idle_callback_tag = 0;
 
   tasklist->priv->monitor_num = -1;
@@ -1170,8 +1176,15 @@ wnck_tasklist_size_request  (GtkWidget  
   requisition->width = tasklist->priv->minimum_width;
   requisition->height = tasklist->priv->minimum_height;
   
-  fake_allocation.width = requisition->width;
-  fake_allocation.height = requisition->height;
+  if (tasklist->priv->last_width != -1)
+	  fake_allocation.width = tasklist->priv->last_width;
+  else
+	  fake_allocation.width = requisition->width;
+
+  if (tasklist->priv->last_height != -1)
+	  fake_allocation.height = tasklist->priv->last_height;
+  else
+	  fake_allocation.height = requisition->height;
 
   array = g_array_new (FALSE, FALSE, sizeof (int));
 
@@ -1298,6 +1311,9 @@ wnck_tasklist_size_allocate (GtkWidget  
   int grouping_limit;
   
   tasklist = WNCK_TASKLIST (widget);
+
+  tasklist->priv->last_width = allocation->width;
+  tasklist->priv->last_height = allocation->height;
 
   n_windows = g_list_length (tasklist->priv->windows);
   n_startup_sequences = g_list_length (tasklist->priv->startup_sequences);