[gnome-panel] main: avoid deprecated gdk_flush

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 734901fc55ed13f37e84d357bc9c54c0d88fedc2
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Thu Sep 13 16:15:17 2018 +0300

    main: avoid deprecated gdk_flush

 gnome-panel/main.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/gnome-panel/main.c b/gnome-panel/main.c
index 1336202bd..0843abb9b 100644
--- a/gnome-panel/main.c
+++ b/gnome-panel/main.c
@@ -127,6 +127,7 @@ int
 main (int argc, char **argv)
 {
        GOptionContext *context;
+       GdkDisplay     *display;
        GError         *error;
        PanelSession   *session;
        GSList         *toplevels_to_destroy;
@@ -145,7 +146,8 @@ main (int argc, char **argv)
        gtk_init (&argc, &argv);
 
        /* FIXME: High dpi scaling does not work... */
-       gdk_x11_display_set_window_scale (gdk_display_get_default (), 1);
+       display = gdk_display_get_default ();
+       gdk_x11_display_set_window_scale (display, 1);
 
        g_unix_signal_add (SIGTERM, on_term_signal, NULL);
        g_unix_signal_add (SIGINT, on_int_signal, NULL);
@@ -183,7 +185,7 @@ main (int argc, char **argv)
 
        /* Flush to make sure our struts are seen by everyone starting
         * immediate after (eg, the nautilus desktop). */
-       gdk_flush ();
+       gdk_display_flush (display);
 
        /* Do this at the end, to be sure that we're really ready when
         * connecting to the session manager */