Since a few days / some Tumbleweed snapshots (looking at /var/log/zypp/history,
the Qt and KDE updates in 20171223 might be a candidate) I noticed a funny 
scrolling problem in KMail.

When reading a long mail (for example a Tumbleweed snapshot announcement), I
can scroll down with the "page down" key exactly once. Pressing page down again
does nothing, even if there's enough text left to scroll down.

If I scroll up again, the "page down" key works again exactly once to scroll to
the "second page", and then it stops to work.


I can scroll down with the "down arrow" key (slowly of course) until the end of
the mail.

Scrolling with the mouse also works until the end of the mail - both by
clicking the scrollbar and by using the mouse wheel.

Oh, and if I scrolled down with the down key or the mouse, pressing "page up"
brings me to the beginning of the mail, as if I had only scrolled down by one
page. Even more funny - pressing "page down" scrolls up to the second page.


This bug was confirmed by some people on the opensuse-factory mailinglist.