patch: add hint about mangled whitespace on bad patch
One of the most common reasons that a patch doesn't apply is because
its whitespace has been mangled (e.g. by their mail client or though
copy&paste). Let's provide a hint about that.
Differential Revision: https://phab.mercurial-scm.org/D11825
@echo off
powershell -NoProfile -ExecutionPolicy unrestricted -Command "& '%~dp0\editmergeps.ps1' %*"