[gnome-panel] run-dialog: avoid deprecated gdk_screen_make_display_name

[Alberts Muktupāvels <muktupavels src gnome org>]

commit d875e34ab2f920017145a323d637dfe6608084f4
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sun Mar 8 14:48:31 2020 +0200

    run-dialog: avoid deprecated gdk_screen_make_display_name

 gnome-panel/panel-run-dialog.c | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)
---
diff --git a/gnome-panel/panel-run-dialog.c b/gnome-panel/panel-run-dialog.c
index cc56525cd..8679fd43b 100644
--- a/gnome-panel/panel-run-dialog.c
+++ b/gnome-panel/panel-run-dialog.c
@@ -308,9 +308,13 @@ command_is_executable (const char   *command,
  * Set the DISPLAY variable, to be use by g_spawn_async.
  */
 static void
-set_environment (gpointer display)
+set_environment (gpointer user_data)
 {
-  g_setenv ("DISPLAY", display, TRUE);
+  GdkDisplay *display;
+
+  display = gdk_display_get_default ();
+
+  g_setenv ("DISPLAY", gdk_display_get_name (display), TRUE);
 }
 
 static void
@@ -457,30 +461,24 @@ panel_run_dialog_launch_command (PanelRunDialog *dialog,
                                 const char     *command,
                                 const char     *locale_command)
 {
-       GdkScreen  *screen;
        gboolean    result;
        GError     *error = NULL;
        char      **argv;
        int         argc;
-       char       *display;
        GPid        pid;
 
        if (!command_is_executable (locale_command, &argc, &argv))
                return FALSE;
 
-       screen = gtk_window_get_screen (GTK_WINDOW (dialog->run_dialog));
-
        if (gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (dialog->terminal_checkbox)))
                panel_run_dialog_prepend_terminal_to_vector (&argc, &argv);
 
-       display = gdk_screen_make_display_name (screen);
-
        result = g_spawn_async (NULL, /* working directory */
                                argv,
                                NULL, /* envp */
                                G_SPAWN_SEARCH_PATH | G_SPAWN_DO_NOT_REAP_CHILD,
                                set_environment,
-                               display,
+                               NULL,
                                &pid,
                                &error);
 
@@ -499,7 +497,6 @@ panel_run_dialog_launch_command (PanelRunDialog *dialog,
                g_child_watch_add (pid, dummy_child_watch, NULL);
        }
 
-       g_free (display);
        g_strfreev (argv);
 
        return result;