Some extra logging of where keys are actually going.

server-client.c

@@ -369,6 +369,8 @@ server_client_check_mouse(struct client *c)
 			wp = window_get_active_at(s->curw->window, x, y);
 			if (wp != NULL)
 				where = PANE;
+			log_debug("mouse at %u,%u is on pane %%%u", x, y,
+			    wp->id);
 		}
 		if (where == NOWHERE)
 			return (KEYC_NONE);