[gtk+] gesture drag: Use GdkEvent API

[Carlos Garnacho <carlosg src gnome org>]

commit b5b84e6abe594e4b96ce1adf9f4c68f39db71f75
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Aug 26 10:52:06 2017 -0400

    gesture drag: Use GdkEvent API

 gtk/gtkgesturedrag.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkgesturedrag.c b/gtk/gtkgesturedrag.c
index f82d13d..b384f4d 100644
--- a/gtk/gtkgesturedrag.c
+++ b/gtk/gtkgesturedrag.c
@@ -65,10 +65,12 @@ gtk_gesture_drag_filter_event (GtkEventController *controller,
   if (gdk_event_get_event_type (event) == GDK_TOUCHPAD_SWIPE)
     {
       guint n_points;
+      guint n_fingers;
 
       g_object_get (G_OBJECT (controller), "n-points", &n_points, NULL);
+      gdk_event_get_touchpad_gesture_n_fingers (event, &n_fingers);
 
-      if (event->touchpad_swipe.n_fingers == n_points)
+      if (n_fingers == n_points)
         return FALSE;
       else
         return TRUE;