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[Launchpad Bug Tracker <1303746@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package qtdeclarative-opensource-src -
5.2.1-3ubuntu15.1

---------------
qtdeclarative-opensource-src (5.2.1-3ubuntu15.1) trusty; urgency=medium

  * debian/patches/QQuickItemView-QQuickPathView-Fix-creation-of-delega.patch:
    - Fix "Carousel doesn't re-render properly after scrolling"
      (LP: #1307578)
  * debian/patches/Implement-proper-support-for-layoutChange-in-QQmlDel.patch:
    - Fix a performance hit when editing sorted lists (LP: #1303746)
  * Update libqt5qml5.symbols (two symbols from the latter patch)
 -- Timo Jyrinki <timo-jyrinki@xxxxxxxxxx>   Fri, 02 May 2014 07:31:28 +0300

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

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https://bugs.launchpad.net/bugs/1303746

Title:
  Performance hit when editing sorted lists

Status in Ubuntu Reminders app:
  Fix Committed
Status in “qtdeclarative-opensource-src” package in Ubuntu:
  Fix Released
Status in “qtdeclarative-opensource-src” source package in Trusty:
  Fix Released

Bug description:
  [Impact]
  Performance regression from saucy in sorted lists, due to lacking a proper way to support layoutChange.

  [Test Case]
  We first noticed this after the migration to Qt 5.2 and using the Reminders app: in summary, when editing a note the application becomes unresponsive on the phone and the CPU goes to 100% on the desktop (there it's not too noticeable).

  [Regression Potential]
  No regressions spotted in utopic with the same patch. List views could be the place where also potential regression would be seen most likely.

  ---
  We first noticed this after the migration to Qt 5.2 and using the Reminders app: in summary, when editing a note the application becomes unresponsive on the phone and the CPU goes to 100% on the desktop (there it's not too noticeable).

  After a chat with mzanetti, this is related to an upstream patch that
  should have probably been implemented differently, and it's now
  reported in the upstream tracker [1].

  This will affect every app using a sorted list on the phone

  [1] https://bugreports.qt-project.org/browse/QTBUG-37983

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