Hi,

‘gnus-ignored-from-addresses’ can be a function,
but this is not supported by ‘gnus-icalendar-identities’ (via 
‘gnus-icalendar-event--find-attendee’).

This means that rendering stops due to an error if an email with 
an icalendar invitation is loaded when gnus-ignored-from-addresses 
is a function. 

I have attached a patch that fixes the bug for me.

Maybe it should be split into two patches as it also changes how 
‘message-alternative-emails’ is handled (this too can be a 
function).

Thanks in advance,
Rasmus
 
In GNU Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 
3.24.23, cairo version 1.17.3) 
 of 2020-10-06 built on X260 
Repository revision: d36cfa21b6b695862dae772a94c63ce3aca8467e 
Repository branch: makepkg Windowing system distributor 'The X.Org 
Foundation', version 11.0.12009000 System Description: Arch Linux 

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