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

[Postix]

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

--- Comment #5 from Postix <postix at posteo.eu> ---
(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.

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