---
Small patch that allows different CSS styling to be applied to each
monitor on a multi-head system. e.g:

window#DP-1 { background-image: url("image.tiff"); }
window#DP-2 { background-image: url("image2.tiff"); }

Code taken from jovanlanik/gtklock on Github

(This is my first time using the email-patch workflow, aplologies if it
is formatted incorrectly)

 gtkgreet/window.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/gtkgreet/window.c b/gtkgreet/window.c
index dcde118..656fb82 100644
--- a/gtkgreet/window.c
+++ b/gtkgreet/window.c
@@ -301,6 +301,8 @@ static gboolean window_background(GtkWidget *widget, cairo_t *cr, gpointer data)
     return FALSE;
 }
 
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+
 struct Window *create_window(GdkMonitor *monitor) {
     struct Window *w = calloc(1, sizeof(struct Window));
     if (w == NULL) {
@@ -312,6 +314,22 @@ struct Window *create_window(GdkMonitor *monitor) {
 
     w->window = gtk_application_window_new(gtkgreet->app);
     g_signal_connect(w->window, "destroy", G_CALLBACK(window_destroy_notify), NULL);
+
+    /*
+		This code uses a deprecated function and assumes one GDK screen...
+		However there isn't really a good way to do this in GTK3 currently.
+		Related issue: https://gitlab.gnome.org/GNOME/gtk/-/issues/4982
+    */
+    char *name = NULL;
+    GdkDisplay *display = gtk_widget_get_display(w->window);
+    GdkScreen *screen = gtk_widget_get_screen(w->window);
+    for(int i = 0; i < gdk_display_get_n_monitors(display); i++) {
+      GdkMonitor *monitor = gdk_display_get_monitor(display, i);
+      if(monitor != w->monitor) continue;
+      name = gdk_screen_get_monitor_plug_name(screen, i);
+    }
+
+    if (name) gtk_widget_set_name(w->window, name);
     gtk_window_set_title(GTK_WINDOW(w->window), "Greeter");
     gtk_window_set_default_size(GTK_WINDOW(w->window), 200, 200);
 
-- 
2.44.0