gtkwidget: Avoid doubly coordinate conversion when emulating press

We are poking again into the event propagation machinery, which
expects events in toplevel coordinates. Since we can't fetch the
original event back at this point, translate the coordinates
back to the toplevel so the emulated press ends up in the right
place.

https://gitlab.gnome.org/GNOME/gtk/issues/1159

Closes: #1159

diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 69a5d2219b0bc8d54219615335809b457f9af4b9..8a42c8073edca11e3ed9449b468011e1d7006211 100644 (file)
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -2523,12 +2523,20 @@ _gtk_widget_emulate_press (GtkWidget      *widget,
 {
   GtkWidget *event_widget, *next_child, *parent;
   GdkEvent *press;
+  gdouble x, y;
 
   event_widget = gtk_get_event_target ((GdkEvent *) event);
 
   if (event_widget == widget)
     return;
 
+  gdk_event_get_coords (event, &x, &y);
+  gtk_widget_translate_coordinatesf (event_widget,
+                                     gtk_widget_get_toplevel (event_widget),
+                                     x, y,
+                                     &x, &y);
+  gdk_event_set_coords (event, x, y);
+
   if (event->any.type == GDK_TOUCH_BEGIN ||
       event->any.type == GDK_TOUCH_UPDATE ||
       event->any.type == GDK_TOUCH_END)