Add date separator to message pane

[cosimo193]

I've been using another email app for a long time now, but would like to use Thunderbird, however there are a few little things that are annoying about the current version compared to my existing app.

I would very much like to see the option to allow the message list to show date separators. With split view, in particular, it is very difficult to find messages by date. Attached is a screenshot of Thunderbird vs my current app, which includes this functionality. 

[Jon]

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