[gtk+] wayland: Stop using gdk_display_get_root_window

[Matthias Clasen <matthiasc src gnome org>]

commit 2eb78a2374a819c7d1be63dd0c700355e6bf50dc
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Nov 5 19:44:39 2017 -0500

    wayland: Stop using gdk_display_get_root_window
    
    We can just use the display field directly.

 gdk/wayland/gdkdevice-wayland.c  |    2 +-
 gdk/wayland/gdkdisplay-wayland.c |    2 +-
 gdk/wayland/gdkwindow-wayland.c  |    2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/gdk/wayland/gdkdevice-wayland.c b/gdk/wayland/gdkdevice-wayland.c
index 73ce17d..d00524f 100644
--- a/gdk/wayland/gdkdevice-wayland.c
+++ b/gdk/wayland/gdkdevice-wayland.c
@@ -586,7 +586,7 @@ gdk_wayland_device_query_state (GdkDevice        *device,
   GdkWaylandPointerData *pointer;
 
   if (window == NULL)
-    window = gdk_display_get_root_window (gdk_device_get_display (device));
+    window = GDK_WAYLAND_DISPLAY (gdk_device_get_display (device))->root_window;
 
   pointer = GDK_WAYLAND_DEVICE (device)->pointer;
 
diff --git a/gdk/wayland/gdkdisplay-wayland.c b/gdk/wayland/gdkdisplay-wayland.c
index b70c706..9e6290d 100644
--- a/gdk/wayland/gdkdisplay-wayland.c
+++ b/gdk/wayland/gdkdisplay-wayland.c
@@ -2100,7 +2100,7 @@ gdk_wayland_display_remove_output (GdkWaylandDisplay *display_wayland,
       g_object_ref (monitor);
       g_ptr_array_remove (display_wayland->monitors, monitor);
       gdk_display_monitor_removed (GDK_DISPLAY (display_wayland), GDK_MONITOR (monitor));
-      window_update_scale (gdk_display_get_root_window (GDK_MONITOR (monitor)->display));
+      window_update_scale (display_wayland->root_window);
       g_object_unref (monitor);
     }
 }
diff --git a/gdk/wayland/gdkwindow-wayland.c b/gdk/wayland/gdkwindow-wayland.c
index 283b604..0339652 100644
--- a/gdk/wayland/gdkwindow-wayland.c
+++ b/gdk/wayland/gdkwindow-wayland.c
@@ -3781,7 +3781,7 @@ gdk_wayland_window_new_subsurface (GdkDisplay         *display,
   attr.height = position->height;
   attr.window_type = GDK_WINDOW_SUBSURFACE;
 
-  return gdk_window_new (display, gdk_display_get_root_window (display), &attr);
+  return gdk_window_new (display, NULL, &attr);
 }
 
 /**