D7849: Fix the tray icon scaling on HiDPI screens

[Piotr Kosinski]

pgkos added a reviewer: Plasma.

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D7849

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