patch 8.0.0513: getting name of cleared highlight group is wrong commit https://github.com/vim/vim/commit/c96272e30e2b81e5e0c8418f09d9db4e2fcd5d73 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Mar 26 13:50:09 2017 +0200 patch 8.0.0513: getting name of cleared highlight group is wrong Problem: Getting name of cleared highlight group is wrong. (Matt Wozniski) Solution: Only skip over cleared names for completion. (closes https://github.com/vim/vim/issues/1592) Also fix that a cleared group causes duplicate completions.

--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -11746,7 +11746,7 @@ f_synIDattr(typval_T *argvars UNUSED, ty
 		break;
 
 	case 'n':					/* name */
-		p = get_highlight_name(NULL, id - 1);
+		p = get_highlight_name_ext(NULL, id - 1, FALSE);
 		break;
 
 	case 'r':					/* reverse */