Tom Hirschowitz <tom.hirschowitz@univ-smb.fr> writes:

> I think Julien meant the 'flagged' tag: just press the space bar to
> switch it on and off.
>
> Regarding the second question, you may filter your search (e.g., by the
> 'flagged' tag) and then tag all messages by pressing *. IIRC there is no
> shortcut for filtering by default. I have this
>
> (define-key notmuch-show-mode-map (kbd "l") 'notmuch-search-filter) 
> (define-key notmuch-search-mode-map (kbd "l") 'notmuch-search-filter) 
> (define-key notmuch-tree-mode-map (kbd "l") 'notmuch-search-filter) 

notmuch-search-filter doesn't seem to work in tree mode: I get

--8<---------------cut here---------------start------------->8---
(void-variable notmuch-search-query-string)
  notmuch-search-filter-by-tag("+unread")
--8<---------------cut here---------------end--------------->8---
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