Message content copy[/paste]

At least within my terminal, copying a message using terminal selection does not work across multiple lines, as it also selects text in one or both of the side bars.

While we could work around this temporarily using autohide, it would be useful to be able to copy selected message(s) independently of how the UI is set up.

This could be for quoting in another stream, or external to ZT.

A feature like this has also been discussed for the webapp, so there may be reference on chat.zulip.org to this, particularly with respect to copying multiple messages (which could be a followup)

This is sort of a UI 'export', so we may want to explore different targets/formats, to include at least some kind of internal message buffer/reference and the native copy/paste buffer.