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[Launchpad Bug Tracker <1275748@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package ubuntu-ui-toolkit -
1.3.1627+15.10.20150908-0ubuntu1

---------------
ubuntu-ui-toolkit (1.3.1627+15.10.20150908-0ubuntu1) wily; urgency=medium

  [ Zsombor Egri ]
  * Implement list item expansion.
  * Turn AdaptivePageLayout page creation to be asynchronous.
  * Fix ListItem swipe handling when gesture is initiated over an overlay
    MouseArea which does not accept pressed event. Fixes LP: #1484545
  * AbstractButton to C++. Fixes LP: #1365471, LP: #1458028
  * Haptics singleton moved to C++.
  * ActionItem moved to C++.
  * Making columns resizable in an AdaptivePageLayout.
  * Introducing column configuration into AdaptivePageLayout.

  [ Benjamin Zeller ]
  * Fix build inside qt and shadowbuild.

  [ Tim Peeters ]
  * Remove old and unused header-related files, and update unit test filenames.
  * Don't unset the subheader style when Page.head changes because that unsets
    the parent of Page.head.contents. Fixes LP: #1488922
  * Fix the theming of the MainView.
  * Fix the background color of the overflow panel.

  [ Christian Dywan ]
  * Include change signals with arguments in .api.
  * A public QML type with no version is an error. Rather than silently breaking
    as QML does normally at least apicheck can make this fatal.
  * UbuntuShape shouldn't emit redundant deprecation warnings. Fixes LP: #1481791
  * Update .bzrignore to new upstream style layout. Fixes LP: #1433308
  * Revert unnecessary change of Popover minimumWidth. Fixes LP: #1483708

  [ Ken VanDine ]
  * Fixed a few typos in the api docs for StateSaver.

  [ Olivier Tilloy ]
  * Take custom key indexes into account to allow sorting on custom roles.
    Fixes LP: #1485674

  [ Albert Astals Cid ]
  * Properly free shapeTextures[index] The old code assumes that the UbuntuShape
    will still be around when the opengl context is destroyed, but that seldom
    happens so connect the signal to a lambda that will be there and does the
    cleanup properly. Without this patch testDirectionalDragArea from unity8 was
    hitting the qFatal because it ran out of space in shapeTextures.

  [ Richard Huddie ]
  * Remove all usage of the autopilot simulated keyboard when the OSK is being
    used. Fixes LP: 31483668

  [ Gerry Boland ]
  * Compensate for Qt's device pixel ratio multiplier.
    Fixes: LP: #1207270, LP: #1275748, LP: #1468402

  [ Nick Dedekind ]
  * Added relative date time i18n.

  [ CI Train Bot ]
  * Resync trunk.

 -- Zoltan Balogh <zoltan.balogh@xxxxxxxxxxxxx>  Tue, 08 Sep 2015
04:10:50 +0000

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

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https://bugs.launchpad.net/bugs/1275748

Title:
  Ubuntu QPA plugin does not override QScreen::devicePixelRatio

Status in qtubuntu:
  In Progress
Status in qtubuntu package in Ubuntu:
  Confirmed
Status in ubuntu-ui-toolkit package in Ubuntu:
  Fix Released

Bug description:
  In bug 1257721, I made Oxide DPI aware by passing an appropriate
  device pixel ratio to Chromium. However, the way this is implemented
  on Ubuntu is not really ideal. I expected to be able to read the DPR
  from QScreen::devicePixelRatio, but this is always 1.0f on Ubuntu
  regardless of the device scale. Instead, device pixel independence is
  implemented entirely in ubuntu-ui-toolkit by providing a QML component
  for converting between grid units and device pixels, based on an
  environment variable called "GRID_UNIT_PX".

  For now, I implemented a workaround in Oxide to also set the DPR to
  GRID_UNIT_PX / 8 when running with the Ubuntu platform plugin, and
  QScreen::devicePixelRatio on all other platforms.

  I think that qtubuntu should instead override
  QScreen::devicePixelRatio (that could still come from the same
  environment variable for now), and ubuntu-ui-toolkit should do the
  conversion from grid units to device pixels using this instead.

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