[PATCH 1 of 4] obsolete: add an `ui.prevent-unstable` option and related function

[Matt Mackall]

On Fri, 2012-12-28 at 23:44 +0100, Pierre-Yves David wrote:
> # HG changeset patch
> # User Pierre-Yves David <pierre-yves.david at ens-lyon.org>
> # Date 1356728772 -3600
> # Node ID 84a2e3e8a7123f6d2593a4c78cca4399d77538b8
> # Parent  8019f96ec4ce96f97dde775fe6f45007f29dabc3
> obsolete: add an `ui.prevent-unstable` option and related function
...
> Rationale:
> 
> With obsolescence marker it is technically possible to rewrite a changeset
> without taking care of its descendants. Advanced user want to benefit from that
> but it seems a bad idea to expose that to new user.

And what's the rationale for an advanced user wanting to do that?

-- 
Mathematics is the supreme nostalgia of our time.