[kmail2] [Bug 388440] New: scrolling in KMail: "page down" only works once

[Christian Boltz]

https://bugs.kde.org/show_bug.cgi?id=388440

            Bug ID: 388440
           Summary: scrolling in KMail: "page down" only works once
           Product: kmail2
           Version: Git (master)
          Platform: Other
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: UI
          Assignee: kdepim-bugs at kde.org
          Reporter: kde-bugs at cboltz.de
  Target Milestone: ---

[initially reported as https://bugzilla.opensuse.org/show_bug.cgi?id=1074271 ]

Since a few days / some openSUSE 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.

Luca Beltrame also confirmed this bug on the current git master state,
therefore I set the version to git instead of 5.7.0 which is currently in
Tumbleweed.

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