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[Launchpad Bug Tracker <1588837@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package ubuntu-ui-toolkit -
1.3.2009+16.10.20160615.3

---------------
ubuntu-ui-toolkit (1.3.2009+16.10.20160615.3) yakkety; urgency=medium

  [ Tim Peeters ]
  * Introduce Styles.SectionsStyle. Fixes LP: #1585548
  * Update header contents only after its style was initialized.
    Fixes LP: #1588837
  * Update export_qml_dir.qml to work inside a lxd container.
  * Draw a red outline around the subheader in AdaptivePageLayout to warn that
    the old header is deprecated. Fixes LP: #1583636

  [ Christian Dywan ]
  * Select the current item before adding the test page.
  * Introduce gallery for browsing visual tests.
  * Put Scrollbar in ShaderEffectSource to blend with frame. Fixes LP: #1583543
  * Correctly use build/src dir with unit tests. Fixes LP: #1589982

  [ Florian Boucault ]
  * Do not initialize haptics at startup but only when used for the first time.
  * PageHeadButton: do not load the icon until the button is made visible.

  [ Albert Astals Cid ]
  * Prepend UC_ to performance env vars.
  * Using -1 as PERFORMANCE_MONITOR_WARNING_COUNT_THRESHOLD envvar disables the
    warning count threshold.
  * Add envvars to change the performance monitor variables.

 -- Zoltán Balogh <zoltan.balogh@xxxxxxxxxxxxx>  Wed, 15 Jun 2016
18:32:29 +0000

** Changed in: ubuntu-ui-toolkit (Ubuntu)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1588837

Title:
  qml/Ubuntu/Components/1.3/PageHeader.qml:123: TypeError: Cannot read
  property 'titleComponent' of null

Status in ubuntu-ui-toolkit package in Ubuntu:
  Fix Released

Bug description:
  Page {
      id: bufferPage
      header: PageHeader {
          title: "foo"
          subtitle: "bar"
      }
  }

  Setting PageHeader.subtitle is racy and produces the following errors
  on startup:

  file:///usr/lib/x86_64-linux-
  gnu/qt5/qml/Ubuntu/Components/1.3/PageHeader.qml:123: TypeError:
  Cannot read property 'titleComponent' of null

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