Explicitly collapse threads

Hello.

I just want to make a feature request and hope this is the right
place to do.

Let's say I want to view all threads in a message pane (index) as
collapsed (except the ones with new messages).

When mutt first opens mailbox, it uncollapses all threads (i.e. shows
all threads uncollapsed (explicitly)), so I use this:

    folder-hook . 'push <collapse-all>'

However, the <collapse-all> command just toggles the *collapse* state
when used repeatedly.  Sometimes, the connection to server is lost
and when mutt reconnects, it uncollapses threads again. So, if I use:

    account-hook  . 'push <collapse-all>'

mutt will just toggle the collapse state every reconnect.

My suggestion is to create explicit <collapse-all> and <uncollapse-all>
commands (whatever their names are) to make it possible to particularly
collapse and uncollapse threads via *account-hook*, *folder-hook* etc.

A big thanks and best wishes to all mutt developers!

-- 
Mikhail.