* fix(__internal) : fix slash problem in oldfiles
- Problems
Problem with slash and backslash being mixed up is chronic issue of
neovim in Windows. it makes telescope prompt perceive same path
differently when it execute to oldfiles picker.
some function like `nvim_buf_get_name()` or `vim.v.oldfiles` give paths
which are mixed up with slash and backslash.
- What it did
For windows, it always needs to change slash(/) to backslash(\) when
function which deal with path because entry_maker works properly only
the case that path string has \ not /.
- Effect
1) oldfiles picker doesn't show duplicated list
2) `defaults.path_display` configuration feature will works well at
oldfiles pikcer
* fix(__internal) : Repeated comments are erased
175178e388