diff -Nru gtk+3.0-3.22.26/debian/changelog gtk+3.0-3.22.26/debian/changelog
--- gtk+3.0-3.22.26/debian/changelog	2017-11-28 23:56:41.000000000 +0100
+++ gtk+3.0-3.22.26/debian/changelog	2017-12-13 16:41:01.000000000 +0100
@@ -1,3 +1,12 @@
+gtk+3.0 (3.22.26-2ubuntu1.1) UNRELEASED; urgency=medium
+
+  * Non-maintainer upload.
+  * Fix LP: #1714518
+      - Add debian/patches/present-fuse-mounts-in-filechooser.patch
+        from upstream
+
+ -- Colin Leroy <colin@colino.net>  Wed, 13 Dec 2017 16:40:17 +0100
+
 gtk+3.0 (3.22.26-2ubuntu1) bionic; urgency=medium
 
   * Merge with Debian. Remaining changes:
diff -Nru gtk+3.0-3.22.26/debian/patches/present-fuse-mounts-in-filechooser.patch gtk+3.0-3.22.26/debian/patches/present-fuse-mounts-in-filechooser.patch
--- gtk+3.0-3.22.26/debian/patches/present-fuse-mounts-in-filechooser.patch	1970-01-01 01:00:00.000000000 +0100
+++ gtk+3.0-3.22.26/debian/patches/present-fuse-mounts-in-filechooser.patch	2017-12-13 16:45:31.000000000 +0100
@@ -0,0 +1,92 @@
+From 0156c52a2cfcc92d89fd7958f639ad47f6891c7c Mon Sep 17 00:00:00 2001
+From: Colin Leroy <colin@colino.net>
+Date: Tue, 12 Sep 2017 15:32:36 +0200
+Subject: [PATCH] placesview: Present FUSE-reachable network shares in Other
+ Locations
+
+The documentation about gtk_file_chooser_set_local_only() states
+that "non-native files may still be available using the native
+filesystem via a userspace filesystem (FUSE)."
+The code that made this possible in GTK+2 was missing from GTK+3 and
+that represented a regression for Linux users in numerous applications
+(Firefox, Thunderbird, Chromium, ...)
+
+https://bugzilla.gnome.org/show_bug.cgi?id=787128
+---
+ gtk/gtkplacesview.c | 43 ++++++++++++++++++++++++++++++++++++++++---
+ 1 file changed, 40 insertions(+), 3 deletions(-)
+
+Index: gtk+3.0-3.22.26/gtk/gtkplacesview.c
+===================================================================
+--- gtk+3.0-3.22.26.orig/gtk/gtkplacesview.c
++++ gtk+3.0-3.22.26/gtk/gtkplacesview.c
+@@ -1183,8 +1183,7 @@ update_places (GtkPlacesView *view)
+   populate_servers (view);
+ 
+   /* fetch networks and add them asynchronously */
+-  if (!gtk_places_view_get_local_only (view))
+-    fetch_networks (view);
++  fetch_networks (view);
+ 
+   update_view_mode (view);
+   /* Check whether we still are in a loading state */
+@@ -1905,12 +1904,37 @@ on_listbox_row_activated (GtkPlacesView
+ }
+ 
+ static gboolean
++is_mount_locally_accessible (GMount *mount)
++{
++  GFile *base_file;
++  gchar *path;
++
++  if (mount == NULL)
++    return FALSE;
++
++  base_file = g_mount_get_root (mount);
++
++  if (base_file == NULL)
++    return FALSE;
++
++  path = g_file_get_path (base_file);
++  g_object_unref (base_file);
++
++  if (path == NULL)
++    return FALSE;
++
++  g_free (path);
++  return TRUE;
++}
++
++static gboolean
+ listbox_filter_func (GtkListBoxRow *row,
+                      gpointer       user_data)
+ {
+   GtkPlacesViewPrivate *priv;
+   gboolean is_network;
+   gboolean is_placeholder;
++  gboolean is_local = FALSE;
+   gboolean retval;
+   gboolean searching;
+   gchar *name;
+@@ -1923,7 +1947,20 @@ listbox_filter_func (GtkListBoxRow *row,
+   is_network = GPOINTER_TO_INT (g_object_get_data (G_OBJECT (row), "is-network"));
+   is_placeholder = GPOINTER_TO_INT (g_object_get_data (G_OBJECT (row), "is-placeholder"));
+ 
+-  if (is_network && priv->local_only)
++  if (GTK_IS_PLACES_VIEW_ROW (row))
++    {
++      GtkPlacesViewRow *placesviewrow;
++      GMount *mount;
++
++      placesviewrow = GTK_PLACES_VIEW_ROW (row);
++      g_object_get(G_OBJECT (placesviewrow), "mount", &mount, NULL);
++
++      is_local = is_mount_locally_accessible (mount);
++
++      g_clear_object (&mount);
++    }
++
++  if (is_network && priv->local_only && !is_local)
+     return FALSE;
+ 
+   if (is_placeholder && searching)
diff -Nru gtk+3.0-3.22.26/debian/patches/series gtk+3.0-3.22.26/debian/patches/series
--- gtk+3.0-3.22.26/debian/patches/series	2017-11-28 23:56:41.000000000 +0100
+++ gtk+3.0-3.22.26/debian/patches/series	2017-12-13 16:22:53.000000000 +0100
@@ -25,3 +25,4 @@
 unity-headerbar-maximized-mode.patch
 gtksocket-unscale-before-sending-configurenotify.patch
 no_content_hub.patch
+present-fuse-mounts-in-filechooser.patch