[gtk/matthiasc/for-master] gtk-demo: Fix entry position in dnd demo

[Matthias Clasen <matthiasc src gnome org>]

commit e54060bac209f3a4bd5d52fb941de075a88484e3
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri May 22 13:17:59 2020 -0400

    gtk-demo: Fix entry position in dnd demo
    
    gtk_fixed_get_child_position does not work if children
    have transforms that are not just 2D translations.
    Use gtk_widget_translate_coordinates instead.

 demos/gtk-demo/dnd.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/demos/gtk-demo/dnd.c b/demos/gtk-demo/dnd.c
index fb164e41a2..0d901af6de 100644
--- a/demos/gtk-demo/dnd.c
+++ b/demos/gtk-demo/dnd.c
@@ -309,9 +309,9 @@ edit_cb (GtkWidget *button, GtkWidget *child)
   GtkWidget *canvas = gtk_widget_get_parent (child);
   CanvasItem *item = CANVAS_ITEM (child);
   GtkWidget *entry;
-  int x, y;
+  double x, y;
 
-  gtk_fixed_get_child_position (GTK_FIXED (canvas), child, &x, &y);
+  gtk_widget_translate_coordinates (child, canvas, 0, 0, &x, &y);
 
   entry = gtk_entry_new ();