Comment # 6 on bug 1175037 from Dirk Weber

I found an upstream bug report which describes a very similar issue:
https://www.thewildbeast.co.uk/claws-mail/bugzilla/show_bug.cgi?id=4379

And pango is considered a suspect by claws-development there.

I like to clarify: I observe the problem sporadically (an article every some
days) on Leap 15.2 (which does not have a bleeding edge pango) and also in
Tumbleweed, but with different articles.

But if an article triggers the problem on a system (e.g. Leap 15.2) then every
time after killing and restarting claws-mail selecting the article again will
make claws-mail "freeze" again consuming 100% CPU. So it is reproducible "per
system" but not "across systems".