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diff -up gnome-panel-2.19.92/gnome-panel/launcher.h.desktop-file-monitoring gnome-panel-2.19.92/gnome-panel/launcher.h
--- gnome-panel-2.19.92/gnome-panel/launcher.h.desktop-file-monitoring	2007-09-04 13:34:26.000000000 -0400
+++ gnome-panel-2.19.92/gnome-panel/launcher.h	2007-09-13 12:23:44.000000000 -0400
@@ -13,6 +13,7 @@
 
 #include "applet.h"
 #include "panel-widget.h"
+#include <libgnomevfs/gnome-vfs.h>
 
 G_BEGIN_DECLS
 
@@ -29,6 +30,8 @@ typedef struct {
 	GSList 		  *error_dialogs;
 
 	gulong             destroy_handler;
+
+	GnomeVFSMonitorHandle *monitor; 
 } Launcher;
 
 void panel_launcher_create           (PanelToplevel *toplevel,
diff -up gnome-panel-2.19.92/gnome-panel/panel-ditem-editor.h.desktop-file-monitoring gnome-panel-2.19.92/gnome-panel/panel-ditem-editor.h
--- gnome-panel-2.19.92/gnome-panel/panel-ditem-editor.h.desktop-file-monitoring	2007-09-04 13:34:26.000000000 -0400
+++ gnome-panel-2.19.92/gnome-panel/panel-ditem-editor.h	2007-09-13 12:23:44.000000000 -0400
@@ -101,6 +101,8 @@ void panel_ditem_editor_set_uri (PanelDI
 				 const char       *uri);
 
 G_CONST_RETURN char *panel_ditem_editor_get_uri (PanelDItemEditor *dialog);
+G_CONST_RETURN char *panel_ditem_editor_get_orig_desktop_file (PanelDItemEditor *dialog);
+
 
 void panel_ditem_register_save_uri_func (PanelDItemEditor  *dialog,
 					 PanelDitemSaveUri  save_uri,
diff -up gnome-panel-2.19.92/gnome-panel/launcher.c.desktop-file-monitoring gnome-panel-2.19.92/gnome-panel/launcher.c
--- gnome-panel-2.19.92/gnome-panel/launcher.c.desktop-file-monitoring	2007-09-04 13:34:26.000000000 -0400
+++ gnome-panel-2.19.92/gnome-panel/launcher.c	2007-09-13 12:23:44.000000000 -0400
@@ -285,6 +285,8 @@ static void
 destroy_launcher (GtkWidget *widget,
 		  Launcher  *launcher)
 {
+	if (launcher->monitor)
+		gnome_vfs_monitor_cancel (launcher->monitor);
 	launcher_properties_destroy (launcher);
 	launcher_widget_destroy_open_dialogs (launcher);
 }
@@ -458,6 +460,37 @@ drag_data_get_cb (GtkWidget        *widg
 
 }
 
+static void setup_button (Launcher *launcher);
+
+static void
+desktop_file_changed (GnomeVFSMonitorHandle    *handle,
+		      const gchar              *monitor_uri,
+		      const gchar              *info_uri,
+		      GnomeVFSMonitorEventType  event_type,
+		      gpointer                  user_data)
+{
+	Launcher *launcher = user_data;
+	GKeyFile *key_file;
+
+	if (event_type == GNOME_VFS_MONITOR_EVENT_CHANGED ||
+	    event_type == GNOME_VFS_MONITOR_EVENT_CREATED) {
+		gchar *path;
+
+		path = gnome_vfs_get_local_path_from_uri (monitor_uri);
+
+		key_file = g_key_file_new ();
+		if (g_key_file_load_from_file (key_file, path,
+					       G_KEY_FILE_KEEP_COMMENTS|G_KEY_FILE_KEEP_TRANSLATIONS,
+					       NULL)) {
+			g_key_file_free (launcher->key_file);
+			launcher->key_file = key_file;
+			setup_button (launcher);        
+		}
+
+		g_free (path);
+	}
+}
+
 static Launcher *
 create_launcher (const char *location)
 {
@@ -534,6 +567,25 @@ create_launcher (const char *location)
 	launcher->key_file = key_file;
 	launcher->prop_dialog = NULL;
 	launcher->destroy_handler = 0;
+	launcher->monitor = NULL;
+
+	/* Watch for changes to the desktop file. Since we don't want 
+	 * to do this for every launcher, we only do it if the desktop 
+	 * file contains a X-Panel-Monitor entry.
+	 */
+	if (g_key_file_get_boolean (key_file, "Desktop Entry", "X-Panel-Monitor", NULL)) {
+		gchar *uri;
+
+
+
+		uri = g_strdup_printf ("file:%s", new_location);
+		gnome_vfs_monitor_add (&launcher->monitor, 
+				       uri,
+				       GNOME_VFS_MONITOR_FILE,
+				       desktop_file_changed,
+				       launcher);
+		g_free (uri);
+	}
 
 	/* Icon will be setup later */
 	launcher->button = button_widget_new (NULL /* icon */,
@@ -662,6 +714,15 @@ static void
 launcher_changed (PanelDItemEditor *dialog,
 		  Launcher         *launcher)
 {
+	/* If the user manually changes launcher properties,
+	 * we stop monitoring the desktop file to not overwrite
+	 * user changes.
+	 */
+	if (launcher->monitor) {
+		gnome_vfs_monitor_cancel (launcher->monitor);
+		launcher->monitor = NULL;
+	}
+
 	/* Setup the button look */
 	setup_button (launcher);
 }
@@ -733,6 +794,43 @@ launcher_save_uri (PanelDItemEditor *dia
 	return NULL;
 }
 
+static const char *
+desktop_file_to_monitor (PanelDItemEditor *editor)
+{
+	const char *entry;
+	GKeyFile *key_file;
+
+	/* When the user selects a desktop file in the ditem editor,
+	 * start monitoring the desktop file for changes.
+	 */
+	entry = panel_ditem_editor_get_orig_desktop_file (editor);
+	if (entry) {
+		key_file = g_key_file_new ();
+		if (!g_key_file_load_from_file (key_file, entry, 0, NULL) ||
+		    !panel_util_key_file_get_boolean (key_file, "X-Panel-Monitor", FALSE)) 
+			entry = NULL;
+		g_key_file_free (key_file);
+	}
+
+	return entry;
+}
+
+static void
+start_monitoring (Launcher *launcher)
+{
+	gchar *uri;
+
+	uri = g_strdup_printf ("file:%s", launcher->location);
+	if (launcher->monitor)
+		gnome_vfs_monitor_cancel (launcher->monitor);
+	gnome_vfs_monitor_add (&launcher->monitor, 
+			       uri,
+			       GNOME_VFS_MONITOR_FILE,
+			       desktop_file_changed,
+			       launcher);
+	g_free (uri);
+}
+ 
 static void
 launcher_saved (GtkWidget *dialog,
 		Launcher  *launcher)
@@ -740,11 +838,15 @@ launcher_saved (GtkWidget *dialog,
 	const char  *uri;
 	GConfClient *client;
 	const char  *key;
+	const char *path;
 
 	uri = panel_ditem_editor_get_uri (PANEL_DITEM_EDITOR (dialog));
 	if (panel_launcher_get_filename (uri) != NULL)
 		uri = panel_launcher_get_filename (uri);
 
+	if ((path = desktop_file_to_monitor (PANEL_DITEM_EDITOR (dialog))) != NULL)
+		uri = path;
+
 	if (uri && launcher->location && strcmp (uri, launcher->location)) {
 		client = panel_gconf_get_client ();
 
@@ -757,6 +859,9 @@ launcher_saved (GtkWidget *dialog,
 		if (launcher->location)
 			g_free (launcher->location);
 		launcher->location = g_strdup (uri);
+
+		if (path)
+			start_monitoring (launcher);
 	}
 }
 
@@ -923,6 +1028,7 @@ launcher_new_saved (GtkWidget *dialog,
 	PanelWidget *panel;
 	int          pos;
 	const char  *uri;
+	const char  *path;
 
 	pos = GPOINTER_TO_INT (g_object_get_data (G_OBJECT (dialog), "pos"));
 	panel = g_object_get_data (G_OBJECT (dialog), "panel");
@@ -930,6 +1036,10 @@ launcher_new_saved (GtkWidget *dialog,
 	uri = panel_ditem_editor_get_uri (PANEL_DITEM_EDITOR (dialog));
 	if (panel_launcher_get_filename (uri) != NULL)
 		uri = panel_launcher_get_filename (uri);
+
+	if ((path = desktop_file_to_monitor (PANEL_DITEM_EDITOR (dialog))) != NULL)
+		uri = path;
+
 	panel_launcher_create (panel->toplevel, pos, uri);
 }
 
diff -up gnome-panel-2.19.92/gnome-panel/panel-ditem-editor.c.desktop-file-monitoring gnome-panel-2.19.92/gnome-panel/panel-ditem-editor.c
--- gnome-panel-2.19.92/gnome-panel/panel-ditem-editor.c.desktop-file-monitoring	2007-09-13 12:23:44.000000000 -0400
+++ gnome-panel-2.19.92/gnome-panel/panel-ditem-editor.c	2007-09-13 12:31:03.000000000 -0400
@@ -80,6 +80,8 @@ struct _PanelDItemEditorPrivate
 
 	/* the directory of the theme for the icon, see bug #119208 */
 	char *icon_theme_dir;
+
+	char *orig_desktop_file;
 };
 
 /* Time in seconds after which we save the file on the disk */
@@ -367,6 +369,10 @@ panel_ditem_editor_destroy (GtkObject *o
 		g_free (dialog->priv->icon_theme_dir);
 	dialog->priv->icon_theme_dir = NULL;
 
+	if (dialog->priv->orig_desktop_file != NULL)
+		g_free (dialog->priv->orig_desktop_file);
+	dialog->priv->orig_desktop_file = NULL;
+
 	GTK_OBJECT_CLASS (panel_ditem_editor_parent_class)->destroy (object);
 }
 
@@ -833,6 +839,13 @@ panel_ditem_editor_changed (PanelDItemEd
 							   TRUE);
 	}
 
+	/* When the user changes any fields, unset the orig_desktop_file
+	 * field since the editor contents are not entirely from a desktop
+	 * file anymore.
+	 */ 
+	g_free (dialog->priv->orig_desktop_file);
+	dialog->priv->orig_desktop_file = NULL;
+
 	dialog->priv->dirty = TRUE;
 	g_signal_emit (G_OBJECT (dialog), ditem_edit_signals[CHANGED], 0);
 }
@@ -1005,6 +1018,13 @@ update_editor_from_desktop_file (PanelDI
 		 */ 
 		setup_icon_entry (dialog, icon);
 
+                /* We set the orig_desktop_file field to let the
+                 * launcher know that the editor contents are coming
+                 * directly from a desktop file.
+                 */ 
+                g_free (dialog->priv->orig_desktop_file);
+                dialog->priv->orig_desktop_file = g_strdup (uri);
+
 		g_free (name);
 		g_free (comment);
 		g_free (icon);
@@ -1079,6 +1099,7 @@ update_chooser_for_type (PanelDItemEdito
 		g_assert_not_reached ();
 	}
 
+
 	chooser = dialog->priv->command_browse_filechooser;
 
 	gtk_window_set_title (GTK_WINDOW (chooser),
@@ -1835,3 +1856,12 @@ panel_ditem_register_save_uri_func (Pane
 	dialog->priv->save_uri = save_uri;
 	dialog->priv->save_uri_data = data;
 }
+
+G_CONST_RETURN char *
+panel_ditem_editor_get_orig_desktop_file (PanelDItemEditor *dialog)
+{
+	g_return_val_if_fail (PANEL_IS_DITEM_EDITOR (dialog), NULL);
+
+	return dialog->priv->orig_desktop_file;
+}
+