[PATCH] util: make sortdict.keys() return a copy

[Yuya Nishihara]

On Mon, 30 Jan 2017 23:31:16 -0800, Martin von Zweigbergk via Mercurial-devel wrote:
> # HG changeset patch
> # User Martin von Zweigbergk <martinvonz at google.com>
> # Date 1485845936 28800
> #      Mon Jan 30 22:58:56 2017 -0800
> # Branch stable
> # Node ID d10efbadb064038d3f7ee6ce7bf0988733a2faa5
> # Parent  312b861924c89716d9bdd28dd8698665ef6d0498
> util: make sortdict.keys() return a copy

Seems good for stable, queued, thanks.