[Differential] [Request, 5 lines] D2669: Set offscreen highlight item to invisible when off screen or not being shown

[davidedmundson (David Edmundson)]

davidedmundson created this revision.
davidedmundson added a reviewer: Plasma.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  Gammaray showed a warning about us having a visible item off screen.
  This is obviously a waste of resources, and a bit weird.
  
  We also still had the highlight visible after the drag had finished, just with an
  opacity of 0.

TEST PLAN
  Started plasma, moved a plasmoid about, highlight still worked correctly.

REPOSITORY
  rPLASMADESKTOP Plasma Desktop

REVISION DETAIL
  https://phabricator.kde.org/D2669

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

EMAIL PREFERENCES
  https://phabricator.kde.org/settings/panel/emailpreferences/

To: davidedmundson, #plasma
Cc: plasma-devel, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas
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