Try split instead of preview window for :G

autoload/fugitive.vim

@@ -1544,8 +1544,6 @@ function! fugitive#BufReadStatus() abort
     nnoremap <buffer> <silent> ds :<C-U>execute <SID>StageDiff('Gsdiff')<CR>
     nnoremap <buffer> <silent> dp :<C-U>execute <SID>StageDiffEdit()<CR>
     nnoremap <buffer> <silent> dv :<C-U>execute <SID>StageDiff('Gvdiff')<CR>
-    nnoremap <buffer> <silent> p :<C-U>echoerr 'Use P'<CR>
-    xnoremap <buffer> <silent> p :<C-U>echoerr 'Use P'<CR>
     nnoremap <buffer> <silent> P :<C-U>execute <SID>StagePatch(line('.'),line('.')+v:count1-1)<CR>
     xnoremap <buffer> <silent> P :<C-U>execute <SID>StagePatch(line("'<"),line("'>"))<CR>
     nnoremap <buffer> <silent> q :<C-U>if bufnr('$') == 1<Bar>quit<Bar>else<Bar>bdelete<Bar>endif<CR>
@@ -1557,6 +1555,7 @@ function! fugitive#BufReadStatus() abort
     nnoremap <buffer> <silent> X :<C-U>execute <SID>StageDelete(line('.'),v:count)<CR>
     xnoremap <buffer> <silent> X :<C-U>execute <SID>StageDelete(line("'<"),line("'>")-line("'<")+1)<CR>
     nnoremap <buffer>          . : <C-R>=<SID>fnameescape(get(<SID>StatusCfile(),0,''))<CR><Home>
+    nnoremap <buffer> <silent> q    :<C-U>bdelete<CR>
     nnoremap <buffer> <silent> g?   :help fugitive-:Gstatus<CR>
     nnoremap <buffer> <silent> <F1> :help fugitive-:Gstatus<CR>
 
@@ -1890,10 +1889,29 @@ augroup END
 
 function! s:Status(bang, count, mods) abort
   try
-    exe (a:mods ==# '<mods>' ? '' : a:mods) 'Gpedit :'
+    let dir = b:git_dir
+    let mods = a:mods ==# '<mods>' || empty(a:mods) ? 'leftabove' : a:mods
+    let file = fugitive#Find(':')
+    for winnr in range(1, winnr('$'))
+      if s:cpath(file, fnamemodify(bufname(winbufnr(winnr)), ':p'))
+        exe winnr . 'wincmd w'
+        let w:fugitive_status = dir
+        return s:ReloadStatus()
+      endif
+    endfor
+    let wide = winwidth(0) >= 160
+    if a:count ==# 0
+      exe mods 'Gedit :'
+    elseif a:bang
+      exe mods (a:count ==# -1 && wide ? 'vert' : '') 'Gpedit :'
       wincmd P
-    setlocal foldmethod=syntax foldlevel=1 buftype=nowrite
+    elseif a:count ==# -1 && wide
-    nnoremap <buffer> <silent> q    :<C-U>bdelete<CR>
+      exe mods 'Gvsplit :'
+    else
+      exe mods a:count > 0 ? a:count : '' 'Gsplit :'
+    endif
+    let w:fugitive_status = dir
+    setlocal foldmethod=syntax foldlevel=1
   catch /^fugitive:/
     return 'echoerr v:errmsg'
   endtry
@@ -2817,6 +2835,7 @@ endfunction
 
 function! s:UsableWin(nr) abort
   return a:nr && !getwinvar(a:nr, '&previewwindow') &&
+        \ empty(getwinvar(a:nr, 'fugitive_status')) &&
         \ index(['gitrebase', 'gitcommit'], getbufvar(winbufnr(a:nr), '&filetype')) < 0 &&
         \ index(['nofile','help','quickfix'], getbufvar(winbufnr(a:nr), '&buftype')) < 0
 endfunction
@@ -2840,15 +2859,13 @@ function! s:EditParse(args) abort
 endfunction
 
 function! s:BlurStatus() abort
-  if &previewwindow && get(b:,'fugitive_type', '') ==# 'index'
+  if &previewwindow && get(b:,'fugitive_type', '') ==# 'index' || exists('w:fugitive_status')
     let winnrs = filter([winnr('#')] + range(1, winnr('$')), 's:UsableWin(v:val)')
     if len(winnrs)
       exe winnrs[0].'wincmd w'
-    elseif winnr('$') == 1
-      let tabs = (&go =~# 'e' || !has('gui_running')) && &stal && (tabpagenr('$') >= &stal)
-      execute 'rightbelow' (&lines - &previewheight - &cmdheight - tabs - 1 - !!&laststatus).'new'
     else
-      rightbelow new
+      let wide = winwidth(0) >= 160
+      exe 'rightbelow' (winwidth(0) >= 160 ? 'vert' : '') 'new'
     endif
     if &diff
       let mywinnr = winnr()