[okular] [Bug 396137] New: Okular hangs when scrolling fast on both pdf and djvu documents

[Max Sydorenko]

https://bugs.kde.org/show_bug.cgi?id=396137

            Bug ID: 396137
           Summary: Okular hangs when scrolling fast on both pdf and djvu
                    documents
           Product: okular
           Version: 1.4.2
          Platform: Archlinux Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: maxim.stargazer at gmail.com
  Target Milestone: ---

Fast scrolling through large pdf or djvu document sometimes causes okular to
fail to display content of the pages from some point. It just sits consuming
100% CPU time, pages content never displayed (empty white pages are displayed
with okular logo in the left upper corner). Meanwhile interface remains
responsive and pages, rendered before the hang occured, are still displayed
when you scroll back. Okular does not actually crash, it just hangs, endlessly
running at 100% load.
Most often can be reproduced when holding PgDn(PgUp) continuosly for some time
so okular is forced to go very fast, skipping pages. Sometimes it occurs when
you type in some page number from the middle of the document and go directly. 
This bug is much easier to reproduce when processor is heavily loaded in
background (i.e. building stuff). In that case it could be reproduced almost
every time with any large document. When system is idling it still happens
sometimes but you have to try for a while.

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