ShellApp: Junk last_used_time

Instead of saving the last_used_time per-app, grab the maximum time for all
windows. The logic is less hard to keep track of, and it solves some edge
case issues where windows that no longer exist update the user time, even
if none of the other windows have been used recently.

https://bugzilla.gnome.org/show_bug.cgi?id=660650

src/shell-app.c

@@ -30,9 +30,6 @@ typedef enum {
 typedef struct {
   guint refcount;
 
-  /* Last time the user interacted with any of this application's windows */
-  guint32 last_user_time;
-
   /* Signal connection to dirty window sort list on workspace changes */
   guint workspace_switch_id;
 
@@ -509,15 +506,6 @@ shell_app_activate_window (ShellApp     *app,
         window = most_recent_transient;
 
 
-      if (!shell_window_tracker_is_window_interesting (window))
-        {
-          /* We won't get notify::user-time signals for uninteresting windows,
-           * which means that an app's last_user_time won't get updated.
-           * Update it here instead.
-           */
-          app->running_state->last_user_time = timestamp;
-        }
-
       if (active != workspace)
         meta_workspace_activate_with_focus (workspace, window, timestamp);
       else
@@ -752,6 +740,23 @@ shell_app_is_on_workspace (ShellApp *app,
   return FALSE;
 }
 
+static int
+shell_app_get_last_user_time (ShellApp *app)
+{
+  GSList *iter;
+  int last_user_time;
+
+  last_user_time = 0;
+
+  if (app->running_state != NULL)
+    {
+      for (iter = app->running_state->windows; iter; iter = iter->next)
+        last_user_time = MAX (last_user_time, meta_window_get_user_time (iter->data));
+    }
+
+  return last_user_time;
+}
+
 /**
  * shell_app_compare:
  * @app:
@@ -791,7 +796,8 @@ shell_app_compare (ShellApp *app,
         return -1;
       else if (!app->running_state->windows && other->running_state->windows)
         return 1;
-      return other->running_state->last_user_time - app->running_state->last_user_time;
+
+      return shell_app_get_last_user_time (other) - shell_app_get_last_user_time (app);
     }
 
   return 0;
@@ -871,8 +877,6 @@ shell_app_on_user_time_changed (MetaWindow *window,
 {
   g_assert (app->running_state != NULL);
 
-  app->running_state->last_user_time = meta_window_get_user_time (window);
-
   /* Ideally we don't want to emit windows-changed if the sort order
    * isn't actually changing. This check catches most of those.
    */
@@ -903,8 +907,6 @@ void
 _shell_app_add_window (ShellApp        *app,
                        MetaWindow      *window)
 {
-  guint32 user_time;
-
   if (app->running_state && g_slist_find (app->running_state->windows, window))
     return;
 
@@ -918,10 +920,6 @@ _shell_app_add_window (ShellApp        *app,
   g_signal_connect (window, "unmanaged", G_CALLBACK(shell_app_on_unmanaged), app);
   g_signal_connect (window, "notify::user-time", G_CALLBACK(shell_app_on_user_time_changed), app);
 
-  user_time = meta_window_get_user_time (window);
-  if (user_time > app->running_state->last_user_time)
-    app->running_state->last_user_time = user_time;
-
   if (app->state != SHELL_APP_STATE_STARTING)
     shell_app_state_transition (app, SHELL_APP_STATE_RUNNING);