[gtk/gtk-3-24: 5/5] Merge branch '1411-handle-null-from-nsgraphicscontex' into gtk-3-24.

[John Ralls <jralls src gnome org>]

commit 60dafa38c735fe91a2904dc26b6b97d4e01533a7
Merge: d483c0a05b 7e4cda6c1c
Author: John Ralls <jralls ceridwen us>
Date:   Mon Oct 29 11:29:10 2018 -0700

    Merge branch '1411-handle-null-from-nsgraphicscontex' into gtk-3-24.

 gdk/quartz/gdkquartz.h        |  4 +++-
 gdk/quartz/gdkwindow-quartz.c | 18 +++++++++++-------
 gtk/gtkdnd-quartz.c           | 30 ++++++------------------------
 3 files changed, 20 insertions(+), 32 deletions(-)
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