[PATCH STABLE] py3: avoid iterating over a literal bytes in highlight

[Yuya Nishihara]

On Tue, 12 Nov 2019 11:21:51 +0100, Denis Laxalde wrote:
> # HG changeset patch
> # User Denis Laxalde <denis.laxalde at logilab.fr>
> # Date 1573553103 -3600
> #      Tue Nov 12 11:05:03 2019 +0100
> # Branch stable
> # Node ID 430d80ba9271920ca6da8db62b507390f65d20d1
> # Parent  e513e87b0476cc9a6eb31abe420448877fa9c902
> py3: avoid iterating over a literal bytes in highlight

Queued for stable, thanks.