[gnome-shell/gnome-3-32] shell: Ignore non-toplevels for ShellWindowTracker::tracked-windows-changed

[Florian Müllner <fmuellner src gnome org>]

commit 6bb5c1feecdb7063abf937bcaa4cb53ce8f3fcf6
Author: Carlos Garnacho <carlosg gnome org>
Date:   Fri Jul 19 16:17:54 2019 +0000

    shell: Ignore non-toplevels for ShellWindowTracker::tracked-windows-changed
    
    Popups and other override-redirect windows are meaningless to everything
    that depends on the ShellWindowTracker. Ignoring those windows will result
    in less ShellApp::windows-changed signal emissions, and less activity in
    the AppMenuButton and everything else that depends on them.
    
    Reduces gnome-shell CPU activity while typing on the Epiphany addressbar,
    as the pop up animation there results in a number of xdg_popup being
    created and destroyed.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/642
    https://gitlab.gnome.org/GNOME/mutter/issues/556
    
    
    (cherry picked from commit db9a7ea7a9b4c9485428a63a0bb4b8c2446ba801)

 src/shell-window-tracker.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)
---
diff --git a/src/shell-window-tracker.c b/src/shell-window-tracker.c
index 487bc9b29b..b19bdf2515 100644
--- a/src/shell-window-tracker.c
+++ b/src/shell-window-tracker.c
@@ -535,12 +535,17 @@ track_window (ShellWindowTracker *self,
 
 static void
 shell_window_tracker_on_window_added (MetaWorkspace   *workspace,
-                                   MetaWindow      *window,
-                                   gpointer         user_data)
+                                      MetaWindow      *window,
+                                      gpointer         user_data)
 {
   ShellWindowTracker *self = SHELL_WINDOW_TRACKER (user_data);
+  MetaWindowType window_type = meta_window_get_window_type (window);
 
-  track_window (self, window);
+  if (window_type == META_WINDOW_NORMAL ||
+      window_type == META_WINDOW_DIALOG ||
+      window_type == META_WINDOW_UTILITY ||
+      window_type == META_WINDOW_MODAL_DIALOG)
+    track_window (self, window);
 }
 
 static void