[mutter] window: Add adjust_fullscreen_monitor_rect virtual method

[Carlos Garnacho <carlosg src gnome org>]

commit ae238d1d4d2f7abb3cdb53491a325e741118be71
Author: Hans de Goede <hdegoede redhat com>
Date:   Thu Aug 22 10:55:17 2019 +0200

    window: Add adjust_fullscreen_monitor_rect virtual method
    
    Add an adjust_fullscreen_monitor_rect virtual method to MetaWindowClass
    and call this from setup_constraint_info() if the window is fullscreen.
    
    This allows MetaWindowClass to adjust the monitor-rectangle used to size
    the window when going fullscreen, which will be used in further commits
    for a workaround related to fullscreen games under Xwayland.
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/739

 src/core/constraints.c    | 12 +++++++-----
 src/core/window-private.h |  5 +++++
 src/core/window.c         | 10 ++++++++++
 3 files changed, 22 insertions(+), 5 deletions(-)
---
diff --git a/src/core/constraints.c b/src/core/constraints.c
index 117131b15..1b3676d20 100644
--- a/src/core/constraints.c
+++ b/src/core/constraints.c
@@ -413,11 +413,7 @@ setup_constraint_info (ConstraintInfo      *info,
                                                  logical_monitor,
                                                  &info->work_area_monitor);
 
-  if (!window->fullscreen || !meta_window_has_fullscreen_monitors (window))
-    {
-      info->entire_monitor = logical_monitor->rect;
-    }
-  else
+  if (window->fullscreen && meta_window_has_fullscreen_monitors (window))
     {
       info->entire_monitor = window->fullscreen_monitors.top->rect;
       meta_rectangle_union (&info->entire_monitor,
@@ -430,6 +426,12 @@ setup_constraint_info (ConstraintInfo      *info,
                             &window->fullscreen_monitors.right->rect,
                             &info->entire_monitor);
     }
+  else
+    {
+      info->entire_monitor = logical_monitor->rect;
+      if (window->fullscreen)
+        meta_window_adjust_fullscreen_monitor_rect (window, &info->entire_monitor);
+    }
 
   cur_workspace = window->display->workspace_manager->active_workspace;
   info->usable_screen_region   =
diff --git a/src/core/window-private.h b/src/core/window-private.h
index dd89fdc90..09a3aaadd 100644
--- a/src/core/window-private.h
+++ b/src/core/window-private.h
@@ -578,6 +578,8 @@ struct _MetaWindowClass
                                   MetaWindowUpdateMonitorFlags  flags);
   void (*main_monitor_changed)   (MetaWindow *window,
                                   const MetaLogicalMonitor *old);
+  void (*adjust_fullscreen_monitor_rect) (MetaWindow    *window,
+                                          MetaRectangle *monitor_rect);
   void (*force_restore_shortcuts) (MetaWindow         *window,
                                    ClutterInputDevice *source);
   gboolean (*shortcuts_inhibited) (MetaWindow         *window,
@@ -649,6 +651,9 @@ void        meta_window_update_fullscreen_monitors (MetaWindow         *window,
 
 gboolean    meta_window_has_fullscreen_monitors (MetaWindow *window);
 
+void        meta_window_adjust_fullscreen_monitor_rect (MetaWindow    *window,
+                                                        MetaRectangle *monitor_rect);
+
 void        meta_window_resize_frame_with_gravity (MetaWindow  *window,
                                                    gboolean     user_op,
                                                    int          w,
diff --git a/src/core/window.c b/src/core/window.c
index 850ee21cc..4282d4c2c 100644
--- a/src/core/window.c
+++ b/src/core/window.c
@@ -3624,6 +3624,16 @@ meta_window_has_fullscreen_monitors (MetaWindow *window)
   return window->fullscreen_monitors.top != NULL;
 }
 
+void
+meta_window_adjust_fullscreen_monitor_rect (MetaWindow    *window,
+                                            MetaRectangle *monitor_rect)
+{
+  MetaWindowClass *window_class = META_WINDOW_GET_CLASS (window);
+
+  if (window_class->adjust_fullscreen_monitor_rect)
+    window_class->adjust_fullscreen_monitor_rect (window, monitor_rect);
+}
+
 void
 meta_window_shade (MetaWindow  *window,
                    guint32      timestamp)