[mutter] window: Add "is_focus_async" API

[Marge Bot <marge-bot src gnome org>]

commit 6438919a89a4d0a0430321bedd68689a2c2f6e90
Author: Olivier Fourdan <ofourdan redhat com>
Date:   Thu Feb 11 17:53:59 2021 +0100

    window: Add "is_focus_async" API
    
    X11 clients can use different models of input handling, of which some
    may not result focus being set synchronously.
    
    For such clients, meta_focus_window() will not change the focus itself
    but rely on the client itself to set the input focus on the desired
    window.
    
    Add a new MetaWindow API to check when dealing with such a window.
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1716>

 src/core/window-private.h         |  2 ++
 src/core/window.c                 |  6 ++++++
 src/wayland/meta-window-wayland.c |  7 +++++++
 src/x11/window-x11.c              | 11 +++++++++++
 4 files changed, 26 insertions(+)
---
diff --git a/src/core/window-private.h b/src/core/window-private.h
index 39fd38d125..d1730c9880 100644
--- a/src/core/window-private.h
+++ b/src/core/window-private.h
@@ -613,6 +613,7 @@ struct _MetaWindowClass
   gboolean (*is_stackable)        (MetaWindow *window);
   gboolean (*can_ping)            (MetaWindow *window);
   gboolean (*are_updates_frozen)  (MetaWindow *window);
+  gboolean (*is_focus_async)      (MetaWindow *window);
 
   MetaStackLayer (*calculate_layer) (MetaWindow *window);
 
@@ -883,4 +884,5 @@ void meta_window_force_restore_shortcuts (MetaWindow         *window,
 gboolean meta_window_shortcuts_inhibited (MetaWindow         *window,
                                           ClutterInputDevice *source);
 gboolean meta_window_is_stackable (MetaWindow *window);
+gboolean meta_window_is_focus_async (MetaWindow *window);
 #endif
diff --git a/src/core/window.c b/src/core/window.c
index 8c7f49b217..d99db949f8 100644
--- a/src/core/window.c
+++ b/src/core/window.c
@@ -8631,6 +8631,12 @@ meta_window_is_stackable (MetaWindow *window)
   return META_WINDOW_GET_CLASS (window)->is_stackable (window);
 }
 
+gboolean
+meta_window_is_focus_async (MetaWindow *window)
+{
+  return META_WINDOW_GET_CLASS (window)->is_focus_async (window);
+}
+
 MetaStackLayer
 meta_window_calculate_layer (MetaWindow *window)
 {
diff --git a/src/wayland/meta-window-wayland.c b/src/wayland/meta-window-wayland.c
index e2b7c01b42..31e0ef1032 100644
--- a/src/wayland/meta-window-wayland.c
+++ b/src/wayland/meta-window-wayland.c
@@ -708,6 +708,12 @@ meta_window_wayland_are_updates_frozen (MetaWindow *window)
   return !wl_window->has_been_shown;
 }
 
+static gboolean
+meta_window_wayland_is_focus_async (MetaWindow *window)
+{
+  return FALSE;
+}
+
 static MetaStackLayer
 meta_window_wayland_calculate_layer (MetaWindow *window)
 {
@@ -764,6 +770,7 @@ meta_window_wayland_class_init (MetaWindowWaylandClass *klass)
   window_class->calculate_layer = meta_window_wayland_calculate_layer;
   window_class->map = meta_window_wayland_map;
   window_class->unmap = meta_window_wayland_unmap;
+  window_class->is_focus_async = meta_window_wayland_is_focus_async;
 }
 
 MetaWindow *
diff --git a/src/x11/window-x11.c b/src/x11/window-x11.c
index fcb0653df5..00c8d3c1d4 100644
--- a/src/x11/window-x11.c
+++ b/src/x11/window-x11.c
@@ -2059,6 +2059,16 @@ meta_window_x11_impl_always_update_shape (MetaWindow *window)
   return FALSE;
 }
 
+static gboolean
+meta_window_x11_is_focus_async (MetaWindow *window)
+{
+  MetaWindowX11 *window_x11 = META_WINDOW_X11 (window);
+  MetaWindowX11Private *priv =
+    meta_window_x11_get_instance_private (window_x11);
+
+  return !window->input && priv->wm_take_focus;
+}
+
 static void
 meta_window_x11_class_init (MetaWindowX11Class *klass)
 {
@@ -2089,6 +2099,7 @@ meta_window_x11_class_init (MetaWindowX11Class *klass)
   window_class->calculate_layer = meta_window_x11_calculate_layer;
   window_class->map = meta_window_x11_map;
   window_class->unmap = meta_window_x11_unmap;
+  window_class->is_focus_async = meta_window_x11_is_focus_async;
 
   klass->freeze_commits = meta_window_x11_impl_freeze_commits;
   klass->thaw_commits = meta_window_x11_impl_thaw_commits;