ctrlpvim/ctrlp.vim — pull request #17 by d11wtq (2014-08-08 01:27:17+00:00)
Title: Check shell in Windows before assuming cmd.exe

From https://github.com/kien/ctrlp.vim/pull/598:

> In Windows, some users set the Cygwin shell as their Vim shell, consider
> this before rewriting cd calls. Checking if shellcmdflag contains a
> backslash should catch all true windows shells.
>
> Without this fix, user list commands are broken with a cygwin shell.