[Differential] [Request, 13 lines] D1839: [Panel] Fix warning and don't cause side-effects in binding

[broulik (Kai Uwe Broulik)]

broulik created this revision.
broulik added a reviewer: Plasma.
broulik set the repository for this revision to rPLASMADESKTOP Plasma Desktop.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  The length binding was assigning a value to the length property during the property evaluation.
  Also, containment might be null which was never checked for causing a runtime warning.

TEST PLAN
  Added vertical panel, centered it, put task manager in there, panel would still automatically shrink and grow depending on the number of windows shown

REPOSITORY
  rPLASMADESKTOP Plasma Desktop

REVISION DETAIL
  https://phabricator.kde.org/D1839

AFFECTED FILES
  desktoppackage/contents/views/Panel.qml

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

To: broulik, #plasma
Cc: plasma-devel, sebas
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