** When set, specifies a command used to filter messages. When a message
** is viewed it is passed as standard input to $$display_filter, and the
** filtered message is read from the standard output.
+ ** .pp
+ ** When preparing the message, NeoMutt inserts some escape sequences into the
+ ** text. They are of the form: \fC<esc>]9;XXX<bel>\fP where "XXX" is a random
+ ** 64-bit number.
+ ** .pp
+ ** If these escape sequences interfere with your filter, they can be removed
+ ** using a tool like \fCansifilter\fP or \fCsed 's/^\x1b]9;[0-9]\+\x7//'\fP
+ ** .pp
+ ** If they are removed, then PGP and MIME headers will no longer be coloured.
+ ** This can be fixed by adding this to your config:
+ ** \fCcolor body magenta default '^\[-- .* --\]$$'\fP.
*/
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/*