tests/vim_test/autoload/lh @ 9a42f3562a99

Neovim support: line buffers shouldn't contain newlines

The result of `difflib.unified_diff()` may contains newlines at the end of its
each line. It's suppressed in original Vim, but it's illegal in Neovim.

Since there is no good way to prevent `difflib` from appending newlines to the
results, `_output_preview_text()` function should sanitize it.

Thanks @michamos

Reference:
  https://github.com/neovim/neovim/blob/a5edc5f2572d6d63f7f7a32ae6ec7bcabe1472b6/src/nvim/api/buffer.c#L215
  https://github.com/sjl/gundo.vim/pull/30#issuecomment-170064637

../../bundled/lh-vim-lib/autoload/lh