[evince] shell: better handle external links

[Jose Aliste <jaliste src gnome org>]

commit df38ffdc0a14be1e7870221e0de38056861e6e87
Author: José Aliste <jose aliste gmail com>
Date:   Wed Dec 6 23:35:29 2017 -0300

    shell: better handle external links
    
    Currently we only handle uris with :// and mailto: uris.
    Handle all uris that g_app_info actually can handle.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=791287

 shell/ev-window.c |   10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)
---
diff --git a/shell/ev-window.c b/shell/ev-window.c
index 0fe49ba..03fbb4e 100644
--- a/shell/ev-window.c
+++ b/shell/ev-window.c
@@ -5972,21 +5972,25 @@ launch_external_uri (EvWindow *window, EvLinkAction *action)
        gboolean ret;
        GdkAppLaunchContext *context;
        GdkScreen *screen;
+       GFile *file;
+       gchar *uri_scheme;
 
        screen = gtk_window_get_screen (GTK_WINDOW (window));
        context = gdk_display_get_app_launch_context (gdk_screen_get_display (screen));
        gdk_app_launch_context_set_screen (context, screen);
        gdk_app_launch_context_set_timestamp (context, gtk_get_current_event_time ());
+       file = g_file_new_for_uri (uri);
+       uri_scheme = g_file_get_uri_scheme (file);
+       g_object_unref (file);
 
-       if (!g_strstr_len (uri, strlen (uri), "://") &&
-           !g_str_has_prefix (uri, "mailto:";)) {
+       if (uri_scheme == NULL) {
                gchar *new_uri;
 
                /* Not a valid uri, assume http if it starts with www */
                if (g_str_has_prefix (uri, "www.")) {
                        new_uri = g_strdup_printf ("http://%s";, uri);
                } else {
-                       GFile *file, *parent;
+                       GFile *parent;
 
                        file = g_file_new_for_uri (window->priv->uri);
                        parent = g_file_get_parent (file);