dirstate: requires being in a `changing_parents` `context to set_parents`
Enforcing proper operation scoping on all methods that mutate the dirstate will
tighten correctness and reduce the risk of bugs.
The context to use for this method is obvious, and all code was already
compliant ☺
@echo off
powershell -NoProfile -ExecutionPolicy unrestricted -Command "& '%~dp0\editmergeps.ps1' %*"