Slowness when coloring the index

[Ralf Hildebrandt]

I'm using this to color spammy mails in the index:

folder-hook . "uncolor index *"
folder-hook restore at backup.invalid "color index red       default '~h ^X-Spam:'"

That's working OK, but it's quite slow. It seems that mutt is fetching
the whole body (instead of just the headers). But I can live with that.

When I'm done processing that particular mailbox, I'm marking all messages deleted.
This process again fetches all mails, before marking them delete -- and I fail to understand why...

% mutt -v
Mutt 1.9.4 (2018-02-28)

System: Linux 4.15.0-20-generic (x86_64)
ncurses: ncurses 6.1.20180127 (compiled with 6.1)
libidn: 1.33 (compiled with 1.33)
hcache backend: tokyocabinet 1.4.48


Ralf Hildebrandt
  Geschäftsbereich IT | Abteilung Netzwerk
  Charité - Universitätsmedizin Berlin
  Campus Benjamin Franklin
  Hindenburgdamm 30 | D-12203 Berlin
  Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962
  ralf.hildebrandt at charite.de | https://www.charite.de