[okular] [Bug 403643] Okular stops rendering PDF and uses up 100% cpu (possible regression)

[Postix]

https://bugs.kde.org/show_bug.cgi?id=403643

Postix <postix at posteo.eu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Platform|Ubuntu Packages             |unspecified
     Ever confirmed|0                           |1
            Version|1.4.3                       |19.12.1
             Status|REPORTED                    |CONFIRMED
                 CC|                            |postix at posteo.eu

--- Comment #2 from Postix <postix at posteo.eu> ---
I can confirm this issue. I have an PDF with a lots of scanned pages from a
text book. 

After scrolling and reading a while Okular stops rendering new pages and a few
appear extremely blurry. At the same time the CPU goes to 100% and I can no
longer close the tab of the document, which has problems.

However, I can close the Okular app itself, however it does not terminate
actually, but the process keeps running in the background with 100% CPU.


# System settings
Operating System: Manjaro Linux 
KDE Plasma Version: 5.17.5
KDE Frameworks Version: 5.67.0
Qt Version: 5.14.0
Kernel Version: 5.4.13-3-MANJARO
OS Type: 64-bit
Processors: 4 × Intel® Core™ i7-7500U CPU @ 2.70GHz
Memory: 15,4 GiB

# Additional information
RAM settings are were either set to 2nd or highest setting.

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