From f3b0a3780e60f7b89b4d1f633e1ffc9b2d6ef1fc Mon Sep 17 00:00:00 2001
From: Carlos Garnacho <carlosg@gnome.org>
Date: Fri, 15 Sep 2017 19:39:18 +0200
Subject: [PATCH] gdk: Coalesce 2 GdkWindow fields in GdkPointerWindowInfo
 struct

One used to point to the toplevel and the other to the client-side window
that the pointer pointed to. The latter was made to be like the former in
most places, so put those together, and fix the remaining cases where the
variable might not end up with a toplevel/native window.
---
 gdk/gdkdisplay.c        | 29 ++++++-----------------------
 gdk/gdkdisplayprivate.h |  2 --
 gdk/gdkwindow.c         |  6 +++---
 3 files changed, 9 insertions(+), 28 deletions(-)

diff --git a/gdk/gdkdisplay.c b/gdk/gdkdisplay.c
index ad83511372..4c9454f444 100644
--- a/gdk/gdkdisplay.c
+++ b/gdk/gdkdisplay.c
@@ -346,8 +346,7 @@ gdk_display_class_init (GdkDisplayClass *class)
 static void
 free_pointer_info (GdkPointerWindowInfo *info)
 {
-  if (info->toplevel_under_pointer)
-    g_object_unref (info->toplevel_under_pointer);
+  g_clear_object (&info->window_under_pointer);
   g_slice_free (GdkPointerWindowInfo, info);
 }
 
@@ -736,7 +735,7 @@ switch_to_pointer_grab (GdkDisplay        *display,
 			guint32            time,
 			gulong             serial)
 {
-  GdkWindow *pointer_window, *new_toplevel;
+  GdkWindow *new_toplevel;
   GdkPointerWindowInfo *info;
   GList *old_grabs;
   GdkModifierType state;
@@ -768,13 +767,6 @@ switch_to_pointer_grab (GdkDisplay        *display,
       if (grab == NULL /* ungrab */ ||
 	  (!last_grab->owner_events && grab->owner_events) /* switched to owner_events */ )
 	{
-	  /* We force check what window we're in, and update the toplevel_under_pointer info,
-	   * as that won't get told of this change with toplevel enter events.
-	   */
-	  if (info->toplevel_under_pointer)
-	    g_object_unref (info->toplevel_under_pointer);
-	  info->toplevel_under_pointer = NULL;
-
           /* Ungrabbed slave devices don't have a position by
            * itself, rather depend on its master pointer, so
            * it doesn't make sense to track any position for
@@ -786,7 +778,7 @@ switch_to_pointer_grab (GdkDisplay        *display,
 	  if (new_toplevel)
 	    {
 	      /* w is now toplevel and x,y in toplevel coords */
-	      info->toplevel_under_pointer = g_object_ref (new_toplevel);
+              _gdk_display_set_window_under_pointer (display, device, new_toplevel);
 	      info->toplevel_x = x;
 	      info->toplevel_y = y;
 	      info->state = state;
@@ -803,20 +795,11 @@ switch_to_pointer_grab (GdkDisplay        *display,
               (gdk_device_get_source (source_device) == GDK_SOURCE_TOUCHSCREEN))
             info->need_touch_press_enter = TRUE;
 
-          pointer_window = NULL;
-
-          if (new_toplevel &&
-              !info->need_touch_press_enter)
-            {
-              /* Find (possibly virtual) child window */
-              pointer_window =
-                _gdk_window_find_descendant_at (new_toplevel,
-                                                x, y,
-                                                NULL, NULL);
-            }
+          if (info->need_touch_press_enter)
+            new_toplevel = NULL;
 
 	  /* We're now ungrabbed, update the window_under_pointer */
-	  _gdk_display_set_window_under_pointer (display, device, pointer_window);
+	  _gdk_display_set_window_under_pointer (display, device, new_toplevel);
 	}
     }
 
diff --git a/gdk/gdkdisplayprivate.h b/gdk/gdkdisplayprivate.h
index ee5d694b62..de280c4fb8 100644
--- a/gdk/gdkdisplayprivate.h
+++ b/gdk/gdkdisplayprivate.h
@@ -63,8 +63,6 @@ typedef struct
  */
 typedef struct
 {
-  GdkWindow *toplevel_under_pointer; /* toplevel window containing the pointer, */
-                                     /* tracked via native events */
   GdkWindow *window_under_pointer;   /* window that last got a normal enter event */
   gdouble toplevel_x, toplevel_y;
   guint32 state;
diff --git a/gdk/gdkwindow.c b/gdk/gdkwindow.c
index eb84837c00..045f26d5ed 100644
--- a/gdk/gdkwindow.c
+++ b/gdk/gdkwindow.c
@@ -1313,10 +1313,10 @@ update_pointer_info_foreach (GdkDisplay           *display,
 {
   GdkWindow *window = user_data;
 
-  if (pointer_info->toplevel_under_pointer == window)
+  if (pointer_info->window_under_pointer == window)
     {
-      g_object_unref (pointer_info->toplevel_under_pointer);
-      pointer_info->toplevel_under_pointer = NULL;
+      g_object_unref (pointer_info->window_under_pointer);
+      pointer_info->window_under_pointer = NULL;
     }
 }