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[Launchpad Bug Tracker <1217924@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package qtdeclarative-opensource-src -
5.0.2-6ubuntu2

---------------
qtdeclarative-opensource-src (5.0.2-6ubuntu2) saucy; urgency=low

  * Add qtquick_delegate_creation_range_itemviews.patch to patchset.
    (LP: #1217924)
 -- Michal Sawicz <michal.sawicz@xxxxxxxxxxxxx>   Wed, 11 Sep 2013 14:03:31 +0200

** Changed in: qtdeclarative-opensource-src (Ubuntu)
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1217924

Title:
  Add patch for letting users of a QML ListView specify the delegate
  creation range

Status in “qtdeclarative-opensource-src” package in Ubuntu:
  Fix Released

Bug description:
  By defaeult a QML ItemViews create items from contentY to
  contentY+height (with some buffering before and after). This is
  problematic when you embed an ItemView inside an ItemView (like we do
  in the dash) because you may end up with lots more of delegates
  instantiated than needed.

  This patch adds two properties to the QML ItemViews letting a user
  decided if he wants to provide a range for delegate creation.

  It comes with unit tests that show how only the needed items are being
  created instead of the full item view height.

  After discussing this with the Qt Project QtQuick maintainer at the Qt
  Contributor Summit he rejected the idea to add this new feature in
  upstream Qt he decided to reject the idea as it was adding more
  feature cruft to classes that he wants rewritten. The rewrrite of
  those classes would also add this functionality so we are "safe" in
  this regard.

  The patch need reviewing. I will be adding some Qt knowledgeable
  people to have a look.

  More info at https://bugreports.qt-project.org/browse/QTBUG-32338 and
  https://codereview.qt-project.org/#change,60809

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