[gtk/wip/baedert/single-node-window: 40/47] window: Fix get_surface_transform()

[Timm Bäder <baedert src gnome org>]

commit 70b81260888da697a3d5d55ff1492e649cc320db
Author: Timm Bäder <mail baedert org>
Date:   Wed May 20 09:27:37 2020 +0200

    window: Fix get_surface_transform()
    
    Look at the shadow here.

 gtk/gtkwindow.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkwindow.c b/gtk/gtkwindow.c
index 743210560d..98ae788990 100644
--- a/gtk/gtkwindow.c
+++ b/gtk/gtkwindow.c
@@ -1896,11 +1896,15 @@ gtk_window_native_get_surface_transform (GtkNative *native,
                                          double    *y)
 {
   GtkBorder shadow;
+  GtkCssBoxes css_boxes;
+  const graphene_rect_t *margin_rect;
 
   get_shadow_width (GTK_WINDOW (native), &shadow);
+  gtk_css_boxes_init (&css_boxes, GTK_WIDGET (native));
+  margin_rect = gtk_css_boxes_get_margin_rect (&css_boxes);
 
-  *x = shadow.left;
-  *y = shadow.right;
+  *x = shadow.left - margin_rect->origin.x;
+  *y = shadow.top  - margin_rect->origin.y;
 }
 
 static void