Remove popups and all the associated overlay machinery (they were the last user

of it). display-popup stays but becomes an (undocumented) compatibility command
to open a floating pane.

tty-draw.c

@@ -1,4 +1,4 @@
-/* $OpenBSD: tty-draw.c,v 1.15 2026/07/26 09:02:08 nicm Exp $ */
+/* $OpenBSD: tty-draw.c,v 1.16 2026/09/21 10:22:31 nicm Exp $ */
 
 /*
  * Copyright (c) 2026 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -52,8 +52,7 @@ tty_draw_line_clear(struct tty *tty, u_int px, u_int py, u_int nx,
 		return;
 
 	/* If genuine BCE is available, can try escape sequences. */
-	if (tty->client->overlay_check == NULL &&
-	    !wrapped &&
+	if (!wrapped &&
 	    nx >= 10 &&
 	    !tty_fake_bce(tty, defaults, bg)) {
 		/* Off the end of the line, use EL if available. */