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[Launchpad Bug Tracker <1303746@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package qtdeclarative-opensource-src -
5.2.1-5ubuntu1

---------------
qtdeclarative-opensource-src (5.2.1-5ubuntu1) utopic; urgency=medium

  * Resync with Debian including renamed QML packages (LP: #1313547)
  * Depend conditionally on libgl1 (LP: #1278871)
  * debian/patches/Fix-marking-of-prototype-objects-in-chain.patch
    - Fix a crasher with deleted QQmlCompiledData as suggested by upstream
      (LP: #1304248)
  * 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)
  * debian/patches/V4-regalloc-fix-register-spill-choice-under-high-pre.patch:
    - Fix differing JS results on AMD64/i386 (LP: #1312571)
  * Updated symbols
 -- Timo Jyrinki <timo-jyrinki@xxxxxxxxxx>   Mon, 28 Apr 2014 07:35:22 +0000

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

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

Title:
  Performance hit when editing sorted lists

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

Bug description:
  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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