** Description changed:

  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  when the header is no longer active will revert the flickable margins.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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https://bugs.launchpad.net/bugs/1566231

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

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