From ce6cf6f07e9cc25d3fad0bc90cf9eb7cd80ff2ef Mon Sep 17 00:00:00 2001
From: Christian Brabandt <cb@256bit.org>
Date: Wed, 7 Nov 2018 17:55:11 +0100
Subject: [PATCH] Check that funcrefs() actually exists

closes #1819
---
 plugin/airline.vim | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/plugin/airline.vim b/plugin/airline.vim
index bfc752c..8d4f2da 100644
--- a/plugin/airline.vim
+++ b/plugin/airline.vim
@@ -123,9 +123,10 @@ function! s:airline_toggle()
             \ | endif
 
       autocmd VimResized * unlet! w:airline_lastmode | :call <sid>airline_refresh()
-      if s:has_timers
+      if s:has_timers  && (v:version > 704 || (v:version == 704 && has("patch2137")))
         " do not trigger FocusGained on startup, it might erase the intro
         " screen (see #1817)
+        " needs funcref() which comes with 7.4.2137
         let Handler=funcref('<sid>FocusGainedHandler')
         let s:timer=timer_start(5000, Handler)
       else