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[Albert Astals Cid <albert.astals@xxxxxxxxxxxxx>]

I can't prove that the attached branch really fixes the backtrace of
this bug but this crash is caused because on line

const bool firstItemWithViewOnTop = insert.index == 0 &&
m_firstVisibleIndex == 0 && m_visibleItems.first()->y() +
m_clipItem->y() > contentY();

insert.index is 0 and m_firstVisibleIndex is 0 but
m_visibleItems.first()->y() crashes (i.e. it's probably empty) and this
fixes a case in which m_firstVisibleIndex may get out of sync so I'd say
let's merge this fix and let's monitor errors.ubuntu.com to see if it
continues or it is indeed fixed by this.

** Branch linked: lp:~aacid/unity8/lvwph_firstVisibleIndex_remove

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https://bugs.launchpad.net/bugs/1433056

Title:
  /usr/bin/unity8-dash:7:QQuickItem::y:ListViewWithPageHeader::ListItem::y:ListViewWithPageHeader::onModelUpdated:ListViewWithPageHeader::qt_static_metacall:QMetaObject::activate

Status in unity8 package in Ubuntu:
  In Progress

Bug description:
  The Ubuntu Error Tracker has been receiving reports about a problem
  regarding unity8.  This problem was most recently seen with version
  8.02+15.04.20150123.3-0ubuntu1, the problem page at
  https://errors.ubuntu.com/problem/21e830048762b5352b790f57d783f45cc5b8f7bb
  contains more details.

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