I frequently use block comments to disable sections of terraform code using /* to start disabling and */ to complete. As expected, the code will turn "grey" and lose syntax highlights.

However, when I move the cursor so that the opening /* scrolls off the top of the screen, the previously "grey" code suddenly starts highlighting again. If I stop moving and CTRL-L to redraw the problem goes away and the code goes "grey" again - although in some unidentified cases redraw never fixes this - it's a little frustrating as I never am sure what code is live or not.

I'm on Windows, using VIM 9.0, the vim-terraform pack, gruvbox colorscheme

I believe I did not have this issue to such a great extent with Vim 8.0. I recall attempting Vim 8.2 and reverting to 8.0 after a few days and I'm only seeing this issue again since updating to 9.0 and it's pretty annoying.

I'm not sure if this is a problem with syntax file, colorscheme file or gvim itself - so any pointers on how to narrow it down?

Cheers Pete

  • What "vim-terraform pack"? If it provides a syntax script then you should use their issue tracker.
    – romainl
    May 20, 2023 at 12:32
  • 1
    Sounds like a syntax sync issue; there are some things you can do to increase the sync range, but it might be a symptom of how the syntax file is constructed.
    – D. Ben Knoble
    May 21, 2023 at 20:47
  • I've added a link to the terraform plugin I'm using. I have logged a ticket there - but I wasnot sure if the issue was syntax or colouring or something else. May 22, 2023 at 14:45

1 Answer 1


The comments in the thread for this issue led me to add the following to my vimrc:

  "To keep syntax active?
  set redrawtime=10000 
  set regexpengine=1 "old engine explicitly

I had redrawtime only and that appeared to fix the issue, but it did not seem to be reliable..

EDIT: I've set this in my _vimrc and for now seems to be working..

syntax sync fromstart
  • I take it back - this solution eventually became unreliable too. I'm not sure why it works sometimes and not others Jun 26, 2023 at 16:05

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