[gtk+] gesture swipe: Use GdkEvent API

[Carlos Garnacho <carlosg src gnome org>]

commit 54307516446cc4e33afaae3cc6c968fda8e3c3b6
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Aug 26 10:53:01 2017 -0400

    gesture swipe: Use GdkEvent API

 gtk/gtkgestureswipe.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkgestureswipe.c b/gtk/gtkgestureswipe.c
index bcdd2d1..bb35572 100644
--- a/gtk/gtkgestureswipe.c
+++ b/gtk/gtkgestureswipe.c
@@ -86,10 +86,13 @@ gtk_gesture_swipe_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);
 
-      if (event->touchpad_swipe.n_fingers == n_points)
+      gdk_event_get_touchpad_gesture_n_fingers (event, &n_fingers);
+
+      if (n_fingers == n_points)
         return FALSE;
       else
         return TRUE;