From 8696c880df6d42dd4e832425f0cf9837e49f0a86 Mon Sep 17 00:00:00 2001
From: Jonny Bylsma <jmbylsma@gmail.com>
Date: Mon, 3 Jun 2019 17:12:50 -0400
Subject: [PATCH] In get_hl(), discard returned synIDattr values of -1

---
 autoload/gitgutter/highlight.vim | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/autoload/gitgutter/highlight.vim b/autoload/gitgutter/highlight.vim
index e976d59..fb1dba5 100644
--- a/autoload/gitgutter/highlight.vim
+++ b/autoload/gitgutter/highlight.vim
@@ -133,7 +133,7 @@ endfunction
 
 function! s:get_hl(group, what, mode) abort
   let r = synIDattr(synIDtrans(hlID(a:group)), a:what, a:mode)
-  if r ==# ''
+  if index(['', '-1'], r) >= 0
     return 'NONE'
   endif
   return r