Standardize technique for temporary cd

plugin/fugitive.vim

@@ -610,12 +610,12 @@ call s:command("-nargs=? -complete=customlist,s:CommitComplete Gcommit :execute
 function! s:Commit(args) abort
   let old_type = s:buffer().type()
   let cd = exists('*haslocaldir') && haslocaldir() ? 'lcd ' : 'cd '
-  let cd .= s:fnameescape(getcwd())
+  let dir = getcwd()
   let msgfile = s:repo().dir('COMMIT_EDITMSG')
   let outfile = tempname()
   let errorfile = tempname()
   try
-    cd `=s:repo().tree()`
+    execute cd.'`=s:repo().tree()`'
     let command = 'GIT_EDITOR=false '.s:repo().git_command('commit').' '.a:args
     if a:args =~# '\%(^\| \)--interactive\>'
       execute '!'.command.' 2> '.errorfile
@@ -658,7 +658,7 @@ function! s:Commit(args) abort
   finally
     call delete(outfile)
     call delete(errorfile)
-    exe cd
+    execute cd.'`=dir`'
     call fugitive#reload_status()
   endtry
 endfunction
@@ -701,9 +701,9 @@ function! s:Grep(bang,arg) abort
   let grepprg = &grepprg
   let grepformat = &grepformat
   let cd = exists('*haslocaldir') && haslocaldir() ? 'lcd ' : 'cd '
-  let cd .= s:fnameescape(getcwd())
+  let dir = getcwd()
   try
-    cd `=s:repo().tree()`
+    execute cd.'`=s:repo().tree()`'
     let &grepprg = s:repo().git_command('--no-pager', 'grep', '-n')
     let &grepformat = '%f:%l:%m'
     exe 'grep! '.a:arg
@@ -726,7 +726,7 @@ function! s:Grep(bang,arg) abort
   finally
     let &grepprg = grepprg
     let &grepformat = grepformat
-    exe cd
+    execute cd.'`=dir`'
   endtry
 endfunction
 
@@ -751,16 +751,16 @@ function! s:Log(cmd,...)
   let grepformat = &grepformat
   let grepprg = &grepprg
   let cd = exists('*haslocaldir') && haslocaldir() ? 'lcd ' : 'cd '
-  let cd .= s:fnameescape(getcwd())
+  let dir = getcwd()
   try
-    cd `=s:repo().tree()`
+    execute cd.'`=s:repo().tree()`'
     let &grepprg = call(s:repo().git_command,cmd,s:repo())
     let &grepformat = '%f::%m'
     exe a:cmd
   finally
     let &grepformat = grepformat
     let &grepprg = grepprg
-    exe cd
+    execute cd.'`=dir`'
   endtry
 endfunction