D9300: Store screenMapping info only once

[Laurent Montel]

mlaurent added inline comments.

INLINE COMMENTS

> screenmapper.cpp:202
> +            KConfigGroup group(config, QLatin1String("ScreenMapping"));
> +            QStringList mapping = 
> group.readEntry(QLatin1String("screenMapping"), QStringList{});
> +            setScreenMapping(mapping);

const QStringList

REPOSITORY
  R119 Plasma Desktop

REVISION DETAIL
  https://phabricator.kde.org/D9300

To: amantia, #plasma, mwolff, hein, broulik
Cc: mlaurent, plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, 
jensreuterberg, abetts, sebas, apol, mart