gnu: gtk+: Graft upstream fix for crashes in Emacs and IceCat.

Fixes <https://bugs.gnu.org/34454>.

* gnu/packages/patches/gtk3-fix-deprecation-macro-use.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/gtk.scm (gtk+/fixed): New variable.
(gtk+)[replacement]: New field.

gnu/local.mk

@@ -877,6 +877,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/gtk2-respect-GUIX_GTK2_PATH.patch	\
   %D%/packages/patches/gtk2-respect-GUIX_GTK2_IM_MODULE_FILE.patch \
   %D%/packages/patches/gtk2-theme-paths.patch			\
+  %D%/packages/patches/gtk3-fix-deprecation-macro-use.patch	\
   %D%/packages/patches/gtk3-respect-GUIX_GTK3_PATH.patch	\
   %D%/packages/patches/gtk3-respect-GUIX_GTK3_IM_MODULE_FILE.patch \
   %D%/packages/patches/gtkglext-disable-disable-deprecated.patch \

gnu/packages/gtk.scm

@@ -1,7 +1,7 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2013 Andreas Enge <andreas@enge.fr>
 ;;; Copyright © 2013, 2014, 2015, 2016, 2017, 2018 Ludovic Courtès <ludo@gnu.org>
-;;; Copyright © 2014, 2015, 2017, 2018 Mark H Weaver <mhw@netris.org>
+;;; Copyright © 2014, 2015, 2017, 2018, 2019 Mark H Weaver <mhw@netris.org>
 ;;; Copyright © 2014 Eric Bavier <bavier@member.fsf.org>
 ;;; Copyright © 2015 Federico Beffa <beffa@fbengineering.ch>
 ;;; Copyright © 2015 Paul van der Walt <paul@denknerd.org>
@@ -694,6 +694,7 @@ (define-public gtk+
    ;; NOTE: When updating the version of 'gtk+', the hash of 'mate-themes' in
    ;;       mate.scm will also need to be updated.
    (version "3.24.2")
+   (replacement gtk+/fixed)
    (source (origin
             (method url-fetch)
             (uri (string-append "mirror://gnome/sources/" name "/"
@@ -787,6 +788,18 @@ (define-public gtk+
            (variable "GUIX_GTK3_PATH")
            (files '("lib/gtk-3.0")))))))
 
+;; Fixes a bug in Gtk that causes crashes in IceCat and Emacs.
+;; See <https://bugs.gnu.org/34454>, <https://bugs.gnu.org/34658>,
+;; and <https://gitlab.gnome.org/GNOME/gtk/issues/1523>.
+(define gtk+/fixed
+  (package
+    (inherit gtk+)
+    (source (origin
+              (inherit (package-source gtk+))
+              (patches
+               (cons (search-patch "gtk3-fix-deprecation-macro-use.patch")
+                     (origin-patches (package-source gtk+))))))))
+
 ;;;
 ;;; Guile bindings.
 ;;;

gnu/packages/patches/gtk3-fix-deprecation-macro-use.patch

@@ -0,0 +1,28 @@
+Copied from <https://gitlab.gnome.org/GNOME/gtk/commit/e3a1593a>.
+Fixes upstream bugs <https://gitlab.gnome.org/GNOME/gtk/issues/1523>
+and <https://gitlab.gnome.org/GNOME/gtk/issues/1280>.
+
+diff --git a/gdk/x11/gdkwindow-x11.c b/gdk/x11/gdkwindow-x11.c
+index 97ada6d73919fba3dfe192dd66929e90bc7677bb..764e39495f7edb0c3efe41cca25b8bee4778887d 100644
+--- a/gdk/x11/gdkwindow-x11.c
++++ b/gdk/x11/gdkwindow-x11.c
+@@ -2985,6 +2985,7 @@ gdk_window_x11_set_background (GdkWindow      *window,
+   double r, g, b, a;
+   cairo_surface_t *surface;
+   cairo_matrix_t matrix;
++  cairo_pattern_t *parent_relative_pattern;
+ 
+   if (GDK_WINDOW_DESTROYED (window))
+     return;
+@@ -2997,8 +2998,10 @@ gdk_window_x11_set_background (GdkWindow      *window,
+     }
+ 
+ G_GNUC_BEGIN_IGNORE_DEPRECATIONS
+-  if (pattern == gdk_x11_get_parent_relative_pattern ())
++  parent_relative_pattern = gdk_x11_get_parent_relative_pattern ();
+ G_GNUC_END_IGNORE_DEPRECATIONS
++
++  if (pattern == parent_relative_pattern)
+     {
+       GdkWindow *parent;
+