tpope/vim-vinegar — pull request #16 by serebrov (2014-01-17 11:34:16+00:00)
Title: Fix jumps to the root directory.

Pull request for #14.
It seems that sometimes netrw loses the current dir name and expand('%') becomes empty string.
Using '-' in this situation will jump to the root directory.
This fix saves the original netrw's '-' mapping and uses it to browse up through folders.