D8232: Add option to center shadow

[Henrik Fehlauer]

rkflx added a reviewer: hpereiradacosta.

REPOSITORY
  R31 Breeze

REVISION DETAIL
  https://phabricator.kde.org/D8232

To: rpelorosso, #breeze, #vdg, hpereiradacosta
Cc: rkflx, ngraham, davidedmundson, mart, plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol
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