D10510: Fix window pin not showing

[Eike Hein]

hein created this revision.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.
hein requested review of this revision.

REVISION SUMMARY
  showPin oscillates during startup and the prop being null'd
  on destroy() is not sync, so this creates a race condition.

REPOSITORY
  R119 Plasma Desktop

BRANCH
  Plasma/5.12

REVISION DETAIL
  https://phabricator.kde.org/D10510

AFFECTED FILES
  containments/desktop/package/contents/ui/FolderViewLayer.qml

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