[gtk+/gtk-3-20] GtkPlacesView: check for network:// URI support before using it

[Matthias Clasen <matthiasc src gnome org>]

commit 86855f7531ecc427ede1a93e317673c92edfe6e9
Author: Руслан Ижбулатов <lrn1986 gmail com>
Date:   Sun May 1 19:00:25 2016 +0000

    GtkPlacesView: check for network:// URI support before using it
    
    Specifically, this URI is not supported on Windows, but GFile will
    do its "best" and turn it into GLocalFile("$pwd/network"), with
    spectacularly bad results.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=765858

 gtk/gtkplacesview.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkplacesview.c b/gtk/gtkplacesview.c
index b91394f..162434a 100644
--- a/gtk/gtkplacesview.c
+++ b/gtk/gtkplacesview.c
@@ -19,6 +19,7 @@
 #include "config.h"
 
 #include <gio/gio.h>
+#include <gio/gvfs.h>
 #include <gtk/gtk.h>
 
 #include "gtkintl.h"
@@ -1003,8 +1004,19 @@ fetch_networks (GtkPlacesView *view)
 {
   GtkPlacesViewPrivate *priv;
   GFile *network_file;
+  const gchar * const *supported_uris;
+  gboolean found;
 
   priv = gtk_places_view_get_instance_private (view);
+  supported_uris = g_vfs_get_supported_uri_schemes (g_vfs_get_default ());
+
+  for (found = FALSE; !found && supported_uris && supported_uris[0]; supported_uris++)
+    if (g_strcmp0 (supported_uris[0], "network") == 0)
+      found = TRUE;
+
+  if (!found)
+    return;
+
   network_file = g_file_new_for_uri ("network:///");
 
   g_cancellable_cancel (priv->networks_fetching_cancellable);