From 9fec8aadc54372cbea6ac3c9cf6909054140b573 Mon Sep 17 00:00:00 2001
From: Tim Pope <code@tpope.net>
Date: Wed, 19 Sep 2018 17:37:06 -0400
Subject: [PATCH] Use merge-base as starting point for ranged :Gbrowse

---
 autoload/fugitive.vim | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/autoload/fugitive.vim b/autoload/fugitive.vim
index afc396a..75270d1 100644
--- a/autoload/fugitive.vim
+++ b/autoload/fugitive.vim
@@ -3346,8 +3346,11 @@ function! s:Browse(bang,line1,count,...) abort
       else
         let commit = ''
         if len(merge)
-          let remotehead = cdir . '/refs/remotes/' . remote . '/' . merge
-          let commit = filereadable(remotehead) ? get(readfile(remotehead), 0, '') : ''
+          let owner = s:Owner(@%)
+          let commit = s:TreeChomp('merge-base', 'refs/remotes/' . remote . '/' . merge, empty(owner) ? 'HEAD' : owner, '--')
+          if v:shell_error
+            let commit = ''
+          endif
           if a:count && !a:0 && commit =~# '^\x\{40\}$'
             let blame_list = tempname()
             call writefile([commit, ''], blame_list, 'b')