[gtk/wip/matthiasc/popup5] surface: Fix the fallback move-to-rect implementation

[Matthias Clasen <matthiasc src gnome org>]

commit e5ad4dd642fae8d10b6e3334e320186d34c5f179
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed May 22 23:47:59 2019 +0000

    surface: Fix the fallback move-to-rect implementation
    
    On X11, the final and flipped rects were reporting
    global coordinates. This was showing up as misplaced
    popover beaks.

 gdk/gdksurface.c | 7 +++++++
 1 file changed, 7 insertions(+)
---
diff --git a/gdk/gdksurface.c b/gdk/gdksurface.c
index a10f680d02..ac90d1bc82 100644
--- a/gdk/gdksurface.c
+++ b/gdk/gdksurface.c
@@ -271,6 +271,7 @@ gdk_surface_real_move_to_rect (GdkSurface         *surface,
   GdkRectangle final_rect;
   gboolean flipped_x;
   gboolean flipped_y;
+  int x, y;
 
   /* This implementation only works for backends that
    * can provide root coordinates via get_root_coords.
@@ -373,6 +374,12 @@ gdk_surface_real_move_to_rect (GdkSurface         *surface,
   else
     gdk_surface_move (surface, final_rect.x, final_rect.y);
 
+  gdk_surface_get_origin (toplevel, &x, &y);
+  final_rect.x -= x;
+  final_rect.y -= y;
+  flipped_rect.x -= x;
+  flipped_rect.y -= y;
+
   g_signal_emit_by_name (surface,
                          "moved-to-rect",
                          &flipped_rect,