D9998: Actually quit threads nicely

[Fabian Vogt]

fvogt added a reviewer: anthonyfieroni.

REPOSITORY
  R161 KActivity Manager Service

REVISION DETAIL
  https://phabricator.kde.org/D9998

To: fvogt, #plasma, ivan, anthonyfieroni
Cc: plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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