Flickering window decoration after login

[UserPC2021]

This patch solves the problem:

--- a/src/lightdm-webkit-greeter.c
+++ b/src/lightdm-webkit-greeter.c
@@ -1013,6 +1013,7 @@
   theme = g_key_file_get_string (keyfile, "greeter", "webkit-theme", NULL);

   window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+ gtk_window_set_decorated (window, FALSE);
   screen = gtk_window_get_screen (GTK_WINDOW (window));
   gdk_screen_get_monitor_geometry (screen, gdk_screen_get_primary_monitor (screen), &geometry);
   gtk_window_set_default_size (GTK_WINDOW (window), geometry.width, geometry.height);

[test api (test-api)]

question ?