overlaycontext: allow calling copydata() on clean context
We should just report no copy if the context is clean.
Differential Revision: https://phab.mercurial-scm.org/D6358
[package]
name = "hgdirectffi"
version = "0.1.0"
authors = ["Georges Racinet <gracinet@anybox.fr>"]
description = "Low level Python bindings for hg-core, going through existing C extensions"
[dependencies]
libc = "*"
hg-core = { path = "../hg-core" }
[lib]
crate-type = ["staticlib"]