viewproperties: don't use intermediate tmp file to save viewprops

Méven Carrequested to merge
work/meven/viewproperties-no-tmp-file into master

Requires frameworks/kconfig!393 (merged)

Will require a KF_VERSION bump

BUG https://bugs.kde.org/show_bug.cgi?id=510500

Edited by Méven Car

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