From 41a734ef49c78cfdb97426cda811ee99c39e011a Mon Sep 17 00:00:00 2001
From: Tim Pope <code@tpope.net>
Date: Mon, 3 Jun 2019 21:06:59 -0400
Subject: [PATCH] Fix Fugitive activation when historical version does not
 exist

I believe I omitted BufNewFile here because it seemed like kind of a
silly event for an unmodifiable, unwritable buffer, but I wasn't taking
into account that event is needed for Fugitive to activate.

Closes https://github.com/tpope/vim-fugitive/issues/1261
---
 autoload/fugitive.vim | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/autoload/fugitive.vim b/autoload/fugitive.vim
index 898eba5..126ccf3 100644
--- a/autoload/fugitive.vim
+++ b/autoload/fugitive.vim
@@ -1688,12 +1688,16 @@ function! fugitive#BufReadCmd(...) abort
       if v:shell_error
         let error = b:fugitive_type
         unlet b:fugitive_type
+        setlocal noswapfile
+        if empty(&bufhidden)
+          setlocal bufhidden=delete
+        endif
         if rev =~# '^:\d:'
           let &l:readonly = !filewritable(fugitive#Find('.git/index', dir))
           return 'silent doautocmd BufNewFile'
         else
           setlocal readonly nomodifiable
-          return 'echo ' . string(error)
+          return 'silent doautocmd BufNewFile|echo ' . string(error)
         endif
       elseif b:fugitive_type !~# '^\%(tag\|commit\|tree\|blob\)$'
         return "echoerr ".string("fugitive: unrecognized git type '".b:fugitive_type."'")
@@ -1760,7 +1764,7 @@ function! fugitive#BufReadCmd(...) abort
       setlocal nomodified noswapfile
       let modifiable = rev =~# '^:.:' && b:fugitive_type !=# 'tree'
       let &l:readonly = !modifiable || !filewritable(fugitive#Find('.git/index', dir))
-      if &bufhidden ==# ''
+      if empty(&bufhidden)
         setlocal bufhidden=delete
       endif
       let &l:modifiable = modifiable