[okular] [Bug 418086] Okular starts over rendering preview of page when scrolling

[Albert Astals Cid]

https://bugs.kde.org/show_bug.cgi?id=418086

--- Comment #7 from Albert Astals Cid <aacid at kde.org> ---
(In reply to Postix from comment #5)
> (In reply to Albert Astals Cid from comment #4)
> > In case you know how to compile from git proposed solution at
> > https://invent.kde.org/kde/okular/-/merge_requests/125
> 
> I tried it as follows:
> 
> git clone https://github.com/KDE/okular.git
> cd okular
> git fetch "https://invent.kde.org/aacid/okular.git"
> "fix_unneeeded_rerendering"
> git checkout -b "aacid/okular-fix_unneeeded_rerendering" FETCH_HEAD
> git fetch origin
> git checkout "origin/release/19.12"
> git merge --no-ff "aacid/okular-fix_unneeeded_rerendering"
> 
> mkdir build && cd build
> cmake .. -DCMAKE_BUILD_TYPE=debug -DCMAKE_INSTALL_PREFIX=~/.local
> make -j4
> ./shell/okular
> 
> Then I loaded the problematic PDF, which opened at page 6 as Okular seems to
> use the settings of the package installed Okular.
> 
> Result: 
> 1) Okular first rendered slowy the very big images on page 6
> 2) Then it rendered the rest very quickly
> 3) It started rendering the previews
> 
> Unfortunately, moving the viewport still resulted in re-rendering of 3). :-(
> 
> Or maybe I am doing something wrong here.

Yes you are, please see the end of https://okular.kde.org/download.php

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