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[Launchpad Bug Tracker <1558663@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package ubuntu-ui-toolkit -
1.3.2184+17.04.20170306

---------------
ubuntu-ui-toolkit (1.3.2184+17.04.20170306) zesty; urgency=medium

  [ Adnane Belmadiaf ]
  * Add support for CheckBox label when set
  * Add more tests for checkbox. Fixes LP: #1333228, LP: #1442851.
  * Make sure we resets partial text input from the input method.
    Fixes LP: #1630872.
  * Fix ListItem title/subtitle alignment & elide in RTL mode.
    Fixes LP: #1665944.
  * Fix PageHeader title alignment & elide in RTL mode. Fixes LP: #1665942.
  * Fix UbuntuListView docs. Fixes LP: #1486940.
  * Add count prop to OptionSelector. Fixes LP: #1341559.
  * Replace the hardcoded color with a theme color. Fixes LP: #1664758.
  * Fix the import statement for Menu, MenuBar and MenuGroup.
    Fixes LP: #1660604.

  [ Albert Astals Cid ]
  * Fix memory leak in UCStyleHints
  * ThinDivider: Anchors can't be null, set to undefined
  * No need to call UCUnits::resolveResource to learn we just need to load it
    normally because the fact that we already loaded it normally means we need
    to load it normally. Fixes LP: #1558663.
  * Fix conditional jump or move depends on uninitialised value(s)

  [ Christian Dywan ]
  * Initialize UCApplication with no side effects. Fixes LP: #1662868.
  * Unit test case insensitive FilterBehavior.pattern. Fixes LP: #1663924.
  * ListItemPopover delegate should (in)visible as per action Bug 1662220:
    [ListItem] Popupmenu shows traces of disabled actions

  [ Olivier Tilloy ]
  * Check that window is not null before accessing its activeFocusItem property.
    Fixes LP: #1664620.

  [ Lukáš Tinkl ]
  * Unbreak the startup race between unity8/qtmir and UITK trying talk to
    content-hub. Fixes LP: #1663106.

 -- Zoltán Balogh <zoltan.balogh@xxxxxxxxxxxxx>  Mon, 06 Mar 2017
16:04:56 +0000

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

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https://bugs.launchpad.net/bugs/1558663

Title:
  Ubuntu Components is hard on the disk and CPU when loading images

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

Bug description:
   * Take the following simple example of a listview with an image.
   * run it with strace qmlscene
   * scroll the list to the bottom

  
  When not including "import Ubuntu.Components 1.3" there is exactly one disk access to load the image
  open("/home/tsdgeos_work/test/face.png", O_RDONLY|O_CLOEXEC) = 19

  When including "import Ubuntu.Components 1.3" there are around 500
  disk access including stats for the file and listing the directory
  containing the file (see disk_access file).

  Also for each of those directory listings we're also creating and
  destroying the same QRegExp again and again.

  I understand that some of this overhead is needed since we have that
  thing that loads the best possible file for the given grid units, but
  doing it again and again for the same file seems a bit of overkill,
  maybe we could cache that?

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