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[Pat McGowan <pat.mcgowan@xxxxxxxxxxxxx>]

** Changed in: canonical-devices-system-image
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1566231

Title:
  When changing Page.header, set previous header.parent to null.

Status in Canonical System Image:
  Fix Released
Status in ubuntu-ui-toolkit package in Ubuntu:
  Fix Released
Status in ubuntu-ui-toolkit package in Ubuntu RTM:
  Fix Released

Bug description:
  Currently when Page.header = header1, and then you set Page.header =
  header2, header1.parent will be reverted to the parent that header1
  had before it was assigned to Page.header (and thus re-parented to
  that page).

  Motivation: You want only one header at the same time to touch the
  topMargins of a flickable. We will not set the flickable margins for a
  header that is not visible or has parent null. So unsetting the parent
  when the header is no longer active will revert the flickable margins.
  Here we choose to change header.parent because header.visible may have
  other bindings that we do not need to break this way.

  Note: There will be no ownership transfer. We are changing the
  parentItem, not the QObject parent.

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