[PATCH evolve-ext] fold: require --from flag for folding revisions to working copy

[Pierre-Yves David]

On 01/12/2017 10:50 PM, Martin von Zweigbergk via Mercurial-devel wrote:
> # HG changeset patch
> # User Martin von Zweigbergk <martinvonz at google.com>
> # Date 1484257669 28800
> #      Thu Jan 12 13:47:49 2017 -0800
> # Node ID 80a3dc2541cf09499eab9f8e55d980590372f472
> # Parent  3e270ed7ede06471c71968f148cbfc8e4ea60a54
> fold: require --from flag for folding revisions to working copy

Pushed, thanks. I'm not a huge fan of the what we decided on, but that 
is the best we could find that fitted our constraints.

I've made a minor update to the tests for the "no flag at all" cases.

Thanks.

-- 
Pierre-Yves David