From 9c91766118812acf5f3e226bdfdedba612d93977 Mon Sep 17 00:00:00 2001
From: Andrey Starodubtsev <andrey.starodubtsev@gmail.com>
Date: Fri, 27 Sep 2019 14:39:06 +0300
Subject: [PATCH] Vim's `redraw` can change v:shell_error

If any other plugins besides `vim-fugitive` are present in user's
instance of Vim, they can call external programs to show some
properties. Redraw will force them to call this programs again and value
of last shell error can be changed.
---
 autoload/fugitive.vim | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/autoload/fugitive.vim b/autoload/fugitive.vim
index b954dc8..5af07c0 100644
--- a/autoload/fugitive.vim
+++ b/autoload/fugitive.vim
@@ -4782,9 +4782,10 @@ function! s:BlameSubcommand(line1, count, range, bang, mods, args) abort
     else
       silent! execute '%write !'.basecmd.' > '.temp.' 2> '.error
     endif
+    let l:shell_error = v:shell_error
     redraw
     try
-      if v:shell_error
+      if l:shell_error
         let lines = readfile(error)
         if empty(lines)
           let lines = readfile(temp)