[mutter/wip/exalm/focused-appearance: 992/993] window: Make default focus window on each workspace appear focused

[Alexander Mikhaylenko <alexm src gnome org>]

commit 541730a9b413da3c4dbcba2ba3e709249a23a703
Author: Alexander Mikhaylenko <exalm7659 gmail com>
Date:   Sat Oct 12 23:55:26 2019 +0500

    window: Make default focus window on each workspace appear focused
    
    Makes workspace transitions in gnome-shell look more seamless, since
    both outgoing and incoming workspace have focused windows.
    
    This is only done for click focus mode, since it's not known which
    window would be focused for the other modes.
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/850

 src/core/window-private.h |  2 ++
 src/core/window.c         | 20 ++++++++++++++++++--
 src/core/workspace.c      | 30 ++++++++++++++++++++++++++++++
 3 files changed, 50 insertions(+), 2 deletions(-)
---
diff --git a/src/core/window-private.h b/src/core/window-private.h
index 39fd38d125..83d3a5813f 100644
--- a/src/core/window-private.h
+++ b/src/core/window-private.h
@@ -716,6 +716,8 @@ void        meta_window_get_session_geometry (MetaWindow  *window,
 
 void        meta_window_update_unfocused_button_grabs (MetaWindow *window);
 
+void        meta_window_appears_focused_changed (MetaWindow *window);
+
 void     meta_window_set_focused_internal (MetaWindow *window,
                                            gboolean    focused);
 
diff --git a/src/core/window.c b/src/core/window.c
index 94db840675..bc02ac0be3 100644
--- a/src/core/window.c
+++ b/src/core/window.c
@@ -251,6 +251,10 @@ prefs_changed_callback (MetaPreference pref,
       meta_window_recalc_features (window);
       meta_window_queue (window, META_QUEUE_MOVE_RESIZE);
     }
+  else if (pref == META_PREF_FOCUS_MODE)
+    {
+      meta_window_appears_focused_changed (window);
+    }
 }
 
 static void
@@ -4911,6 +4915,9 @@ set_workspace_state (MetaWindow    *window,
         }
     }
 
+  if (!window->constructing)
+    meta_window_appears_focused_changed (window);
+
   /* queue a move_resize since changing workspaces may change
    * the relevant struts
    */
@@ -5210,7 +5217,7 @@ meta_window_change_workspace_by_index (MetaWindow *window,
     meta_window_change_workspace (window, workspace);
 }
 
-static void
+void
 meta_window_appears_focused_changed (MetaWindow *window)
 {
   set_net_wm_state (window);
@@ -7312,7 +7319,16 @@ meta_window_get_frame (MetaWindow *window)
 gboolean
 meta_window_appears_focused (MetaWindow *window)
 {
-  return window->has_focus || (window->attached_focus_window != NULL);
+  MetaWorkspaceManager *workspace_manager;
+  MetaWorkspace *workspace;
+
+  workspace_manager = window->display->workspace_manager;
+  workspace = meta_window_get_workspace (window);
+
+  if (workspace && workspace != workspace_manager->active_workspace)
+    return window == meta_workspace_get_default_focus_window (workspace);
+  else
+    return window->has_focus || !window->attached_focus_window;
 }
 
 gboolean
diff --git a/src/core/workspace.c b/src/core/workspace.c
index e05a963243..f73aead68e 100644
--- a/src/core/workspace.c
+++ b/src/core/workspace.c
@@ -365,10 +365,31 @@ meta_workspace_remove (MetaWorkspace *workspace)
    */
 }
 
+static void
+workspace_default_focus_changed (MetaWorkspace *workspace,
+                                 MetaWindow    *not_this_one)
+{
+  g_autoptr (GSList) windows = NULL;
+  GSList *l;
+
+  windows = meta_display_list_windows (workspace->display, META_LIST_DEFAULT);
+  for (l = windows; l; l = l->next)
+    {
+      MetaWindow *window = META_WINDOW (l->data);
+
+      if (meta_window_located_on_workspace (window, workspace) &&
+          window != not_this_one)
+        meta_window_appears_focused_changed (window);
+    }
+  }
+}
+
 void
 meta_workspace_add_window (MetaWorkspace *workspace,
                            MetaWindow    *window)
 {
+  MetaWorkspaceManager *workspace_manager = workspace->display->workspace_manager;
+
   COGL_TRACE_BEGIN_SCOPED (MetaWorkspaceAddWindow,
                            "Workspace (add window)");
 
@@ -385,6 +406,9 @@ meta_workspace_add_window (MetaWorkspace *workspace,
       meta_workspace_invalidate_work_area (workspace);
     }
 
+  if (workspace != workspace_manager->active_workspace)
+    workspace_default_focus_changed (workspace, window);
+
   g_signal_emit (workspace, signals[WINDOW_ADDED], 0, window);
   g_object_notify_by_pspec (G_OBJECT (workspace), obj_props[PROP_N_WINDOWS]);
 }
@@ -393,6 +417,8 @@ void
 meta_workspace_remove_window (MetaWorkspace *workspace,
                               MetaWindow    *window)
 {
+  MetaWorkspaceManager *workspace_manager = workspace->display->workspace_manager;
+
   COGL_TRACE_BEGIN_SCOPED (MetaWorkspaceRemoveWindow,
                            "Workspace (remove window)");
 
@@ -409,6 +435,9 @@ meta_workspace_remove_window (MetaWorkspace *workspace,
       meta_workspace_invalidate_work_area (workspace);
     }
 
+  if (workspace != workspace_manager->active_workspace)
+    workspace_default_focus_changed (workspace, window);
+
   g_signal_emit (workspace, signals[WINDOW_REMOVED], 0, window);
   g_object_notify (G_OBJECT (workspace), "n-windows");
 }
@@ -657,6 +686,7 @@ meta_workspace_activate_with_focus (MetaWorkspace *workspace,
   if (focus_this)
     {
       meta_window_activate (focus_this, timestamp);
+      workspace_default_focus_changed (workspace, focus_this);
     }
   else if (move_window)
     {