D6274: Use AbstractClient instead of Client in placement

[Marco Martin]

mart accepted this revision.

REPOSITORY
  R108 KWin

BRANCH
  placement-fix-abstract-client-casts

REVISION DETAIL
  https://phabricator.kde.org/D6274

To: graesslin, #kwin, #plasma, davidedmundson, mart
Cc: plasma-devel, kwin, ZrenBot, spstarr, progwolff, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart, lukas
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