app-manager optimizations

- simplify lookup by pid
- less calls to wnck_window_get_pid
- use a gint for the pid

src/app-manager.h

@@ -23,7 +23,7 @@ typedef struct _App App;
 struct _App
 {
 	WnckApplication *	application;
-	guint			pid;
+	gint			pid;
 	gchar			name[1024];
 	GdkPixbuf *		icon;
 };
@@ -39,7 +39,6 @@ typedef struct _XtmAppManager XtmAppManager;
 
 GType			xtm_app_manager_get_type			(void);
 XtmAppManager *		xtm_app_manager_new				(void);
-const GArray *		xtm_app_manager_get_app_list			(XtmAppManager *manager);
 App *			xtm_app_manager_get_app_from_pid		(XtmAppManager *manager, gint pid);
 
 #endif /* !APP_MANAGER_H */