Added missing commits

sources_non_forked/vim-gitgutter/autoload/gitgutter/fold.vim

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+function! gitgutter#fold#enable()
+  call s:save_fold_state()
+
+  call s:set_fold_levels()
+  setlocal foldexpr=gitgutter#fold#level(v:lnum)
+  setlocal foldmethod=expr
+  setlocal foldlevel=0
+  setlocal foldenable
+
+  call gitgutter#utility#setbufvar(bufnr(''), 'folded', 1)
+endfunction
+
+
+function! gitgutter#fold#disable()
+  call s:restore_fold_state()
+  call gitgutter#utility#setbufvar(bufnr(''), 'folded', 0)
+endfunction
+
+
+function! gitgutter#fold#toggle()
+  if s:folded()
+    call gitgutter#fold#disable()
+  else
+    call gitgutter#fold#enable()
+  endif
+endfunction
+
+
+function! gitgutter#fold#level(lnum)
+  return gitgutter#utility#getbufvar(bufnr(''), 'fold_levels')[a:lnum]
+endfunction
+
+
+" A line in a hunk has a fold level of 0.
+" A line within 3 lines of a hunk has a fold level of 1.
+" All other lines have a fold level of 2.
+function! s:set_fold_levels()
+  let fold_levels = ['']
+
+  for lnum in range(1, line('$'))
+    let in_hunk = gitgutter#hunk#in_hunk(lnum)
+    call add(fold_levels, (in_hunk ? 0 : 2))
+  endfor
+
+  let lines_of_context = 3
+
+  for lnum in range(1, line('$'))
+    if fold_levels[lnum] == 2
+      let pre = lnum >= 3 ? lnum - lines_of_context : 0
+      let post = lnum + lines_of_context
+      if index(fold_levels[pre:post], 0) != -1
+        let fold_levels[lnum] = 1
+      endif
+    endif
+  endfor
+
+  call gitgutter#utility#setbufvar(bufnr(''), 'fold_levels', fold_levels)
+endfunction
+
+
+function! s:save_fold_state()
+  let bufnr = bufnr('')
+  call gitgutter#utility#setbufvar(bufnr, 'foldlevel', &foldlevel)
+  call gitgutter#utility#setbufvar(bufnr, 'foldmethod', &foldmethod)
+  if &foldmethod ==# 'manual'
+    mkview
+  endif
+endfunction
+
+function! s:restore_fold_state()
+  let bufnr = bufnr('')
+  let &foldlevel = gitgutter#utility#getbufvar(bufnr, 'foldlevel')
+  let &foldmethod = gitgutter#utility#getbufvar(bufnr, 'foldmethod')
+  if &foldmethod ==# 'manual'
+    loadview
+  else
+    normal! zx
+  endif
+endfunction
+
+function! s:folded()
+  return gitgutter#utility#getbufvar(bufnr(''), 'folded')
+endfunction
+