The floating_recipient_bar is cloned from recipient_bar elements.
The cloning created elements in the DOM with duplicate id
attributes, specifically <span id="timerender{id}">, which
contains the date of the message stream. The timerender span
will now use class="timerender{id}" instead.
Fixes#4997.
Fixes#5128.
timerender.js render_now() will always include older
years when rendering the date stamp on the recipient bar
and the date rows above messages.
Fixes#4843.
David Coleman
Steve Howell