patch 8.0.0205: wrong behavior after :undojoin commit https://github.com/vim/vim/commit/5e4e1b12998b1ed99138cad1c5da4d430f798547 Author: Bram Moolenaar <Bram@vim.org> Date: Tue Jan 17 22:09:45 2017 +0100 patch 8.0.0205: wrong behavior after :undojoin Problem: After :undojoin some commands don't work properly, such as :redo. (Matthew Malcomson) Solution: Don't set curbuf->b_u_curhead. (closes #1390)

--- a/src/undo.c
+++ b/src/undo.c
@@ -3136,11 +3136,8 @@ ex_undojoin(exarg_T *eap UNUSED)
     if (get_undolevel() < 0)
 	return;		    /* no entries, nothing to do */
     else
-    {
-	/* Go back to the last entry */
-	curbuf->b_u_curhead = curbuf->b_u_newhead;
-	curbuf->b_u_synced = FALSE;  /* no entries, nothing to do */
-    }
+	/* Append next change to the last entry */
+	curbuf->b_u_synced = FALSE;
 }
 
 /*