[gtk+] flowbox: Convert to GdkEvent API

[Carlos Garnacho <carlosg src gnome org>]

commit 6b4dfcadaf2b9b649570f2fa1d9d8d9b1144d210
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Aug 25 22:53:19 2017 -0400

    flowbox: Convert to GdkEvent API

 gtk/gtkflowbox.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkflowbox.c b/gtk/gtkflowbox.c
index 815428d..a83c9bd 100644
--- a/gtk/gtkflowbox.c
+++ b/gtk/gtkflowbox.c
@@ -2637,12 +2637,15 @@ gtk_flow_box_leave_notify_event (GtkWidget        *widget,
   GtkFlowBox *box = GTK_FLOW_BOX (widget);
   GtkFlowBoxChild *child = NULL;
   gdouble x, y;
+  GdkNotifyType detail;
 
   if (gdk_event_get_window ((GdkEvent *) event) !=
       gtk_widget_get_window (GTK_WIDGET (box)))
     return FALSE;
 
-  if (event->detail != GDK_NOTIFY_INFERIOR)
+  gdk_event_get_crossing_detail ((GdkEvent *)event, &detail);
+
+  if (detail != GDK_NOTIFY_INFERIOR)
     child = NULL;
   else if (gdk_event_get_coords ((GdkEvent *) event, &x, &y))
     child = gtk_flow_box_get_child_at_pos (box, x, y);