patch 9.0.0329: ":highlight" hangs when 'cmdheight' is zero Commit: https://github.com/vim/vim/commit/24735f2a19c666f545330a267a32ae5df72db25c Author: Bram Moolenaar <Bram@vim.org> Date: Tue Aug 30 15:44:22 2022 +0100 patch 9.0.0329: ":highlight" hangs when 'cmdheight' is zero Problem: ":highlight" hangs when 'cmdheight' is zero. Solution: Add to msg_col when using the message window. (closes https://github.com/vim/vim/issues/11014)

--- a/src/highlight.c
+++ b/src/highlight.c
@@ -1429,6 +1429,7 @@ do_highlight(
     // If no argument, list current highlighting.
     if (!init && ends_excmd2(line - 1, line))
     {
+	dont_use_message_window();
 	for (i = 1; i <= highlight_ga.ga_len && !got_int; ++i)
 	    // TODO: only call when the group has attributes set
 	    highlight_list_one((int)i);