contrib/packaging/debian/control

resolve: use the `parentchange` context manager to apply merge action

In an ideal world, we would not have to do that. However, we are miles away from
being ready to not have to do it.

So we add this context manager alongside a long comment. This will help use to
get to the point were have two distinct API with strict rules about when to call
them.

Differential Revision: https://phab.mercurial-scm.org/D11074

Source: mercurial
Section: vcs
Priority: optional
Maintainer: Mercurial Developers <[e-mail]>
Build-Depends:
 debhelper (>= 9),
 dh-python,
 less,
 netbase,
 python3-all,
 python3-all-dev,
 python3-docutils,
 unzip,
 zip
Standards-Version: 3.9.4
X-Python3-Version: >= 3.5

Package: mercurial
Depends:
 sensible-utils,
 ${shlibs:Depends},
 ${misc:Depends},
 ${python3:Depends},
Recommends: ca-certificates
Suggests: wish
Replaces: mercurial-common
Breaks: mercurial-common
Provides: python3-mercurial
Architecture: any
Homepage: https://www.mercurial-scm.org/
Description: fast, easy to use, distributed revision control tool.
 Mercurial is a fast, lightweight Source Control Management system designed
 for efficient handling of very large distributed projects.
 .
 Its features include:
  * O(1) delta-compressed file storage and retrieval scheme
  * Complete cross-indexing of files and changesets for efficient exploration
    of project history
  * Robust SHA1-based integrity checking and append-only storage model
  * Decentralized development model with arbitrary merging between trees
  * Easy-to-use command-line interface
  * Integrated stand-alone web interface
  * Small Python codebase