Date separators don't update unless the timeline changes

[turt2live]

Description

In a room with just myself I had posted something yesterday and today the label was still stuck at "Today". When I sent another message the separator happily changed to "Yesterday".

It's a bit confusing at first when the date separator doesn't change with the clock.

Steps to reproduce

• In a room by yourself, send a message at 23:59 such that the "Today" header is visible
• Wait until the clock strikes 00:00 (or later)
• Note that the header is still "Today" (send another message to see it change)

Version information

• Platform: web (in-browser)
• Browser: Chrome 63
• OS: Windows 10
• URL: riot.im/develop

[t3chguy]

Believed to be fixed, no reproduction in years