Collapse older responses

It would be nice if older messages could be collapsed to a minimum on large threads. Since threads could become quite long, i’ve to scroll quite some to the bottom to see the most recent info.
For example see how jira does it;

In addition to this, it would nice if there is an option to sort the message’s/articles from most recent (on-top) to oldest. Instead of having the most recent message always being on the bottom of the ticket.

Related to this it would be nice if only the replied content is shown;

and related;


Like it.
For your ticket it would be nice if I could mark mails as important, which then not auto-collapse.

I have a similar request here (May support it with a like):


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