patch 8.2.2622: GTK: error when starting up and -geometry is given

Problem:    GTK: error when starting up and -geometry is given. (Dominique
            Pellé)
Solution:   Use another function to get the monitor if the window has not been
            created yet. (closes #7978)
diff --git a/src/gui_xim.c b/src/gui_xim.c
index ee92301..2dd6fd9 100644
--- a/src/gui_xim.c
+++ b/src/gui_xim.c
@@ -207,7 +207,7 @@
     if (preedit_window == NULL)
 	return;
 
-    gui_gtk_get_screen_geom_of_win(gui.drawarea,
+    gui_gtk_get_screen_geom_of_win(gui.drawarea, 0, 0,
 			  &screen_x, &screen_y, &screen_width, &screen_height);
     gdk_window_get_origin(gtk_widget_get_window(gui.drawarea), &x, &y);
     gtk_window_get_size(GTK_WINDOW(preedit_window), &width, &height);