bug#20468: 25.0.50; erc timestamps not displayed

[Eli Zaretskii]

> Date: Thu, 30 Apr 2015 09:49:50 +0200
> From: Cédric Chépied
>       <cedric.chepied@gmail.com>
> 
> I can't see erc timestamps anymore. They are still there because when I copy
> some text in erc buffer they are added in kill ring and, with fill mode, new
> lines are aligned as if there was a timestamp but I can't see them and
> there is no blank space instead of them.
> 
> what I see:
> <chep> this is a test for emacs bug report. That's why I'm talking to
>               myself. Anyway I like to talk to myself because I agree with me
> 
> What I see if I copy/paste the last exemple:
> [09:41]<chep> this is a test for emacs bug report. That's why I'm talking to
>               myself. Anyway I like to talk to myself because I agree with me
> 
> erc-hide-timestamps is nil

Crystal ball here says it's because of
84e0b7dad6f1a8e53261f9b96f5a9080fea681a4.  Can you check?