Ignore-thread behaviour changed

[Peter Humphrey]

Afternoon all,

It used to be that, if I marked a thread to be ignored, it was. Now, though, 
it's just skipped, and the next message in the thread un-ignores it.

Why this change?

-- 
Regards,
Peter.

Gentoo testing system, openrc-0.42.1
gcc 9.3.0, sys-kernel/gentoo-sources 5.4.38
QT 5.15.0, KDE frameworks 5.70.0, KDE plasma 5.18.5
KDE apps 20.04.1 incl KMail 5.14.1 (20.04.0), akonadi 20.04.1
dev-db/mariadb-10.4.12, net-libs/webkit-gtk-2.28.2
x11-drivers/xf86-video-amdgpu 19.1.0
dev-libs/amdgpu-pro-opencl-19.30.838629