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[Launchpad Bug Tracker <1467740@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package unity8 - 8.11+15.10.20150915-0ubuntu1

---------------
unity8 (8.11+15.10.20150915-0ubuntu1) wily; urgency=medium

  [ Albert Astals Cid ]
  * Fix testNotifications
  * Make the wait longer to make tests pass in CI
  * New simplified CroppedImageMinimumSourceSize (LP: #1467740)
  * Stop animateTimer when starting the fadeOutAnimation
  * Use  AlreadyLaunchedUpstart so that tests passes
  * Workaround keyboard issues and make test pass again

  [ Daniel d'Andrada ]
  * DesktopStage: Refactor focus handling
  * Stabilize tstShell.test_launchedAppHasActiveFocus

  [ Gary.Wzl ]
  * Add widgetData["expanded"] property for expandable widget.

  [ Michael Terry ]
  * Fix typo that caused the tutorial to tease the launcher on top of
    the greeter.
  * Fix typo that caused the tutorial to tease the launcher on top of
    the greeter.

 -- Michael Zanetti <michael.zanetti@xxxxxxxxxxxxx>  Tue, 15 Sep 2015
12:06:06 +0000

** Changed in: unity8 (Ubuntu)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1467740

Title:
  Lots of thumbnail requests with invalid size

Status in thumbnailer package in Ubuntu:
  New
Status in unity8 package in Ubuntu:
  Fix Released

Bug description:
  When using scopes, the thumbnailer gets loads of requests with
  QSize(-1,-1) from the shell. For example, with a bunch of videos
  recorded, run up the video scope and go to "My Videos". The shell asks
  for a thumbnail at QSize(-1,-1) for the tiny thumbnail that appears to
  the left of each list entry.

  The problem with this is that the thumbnailer interprets this to mean
  "give me the largest size you can (limited to a 1920x1920 bounding
  box). That's very expensive, especially in terms of disk space,
  because that 1920 "thumbnail" ends up going into the cache, needlessly
  hogging space.

  We are about to add a qWarning message to the QML side that reports
  invalid QSize requests. For now, we are going to retain the old
  behavior, but this will turn into an error soon.

  The most effective way to use the thumbnailer is to simply ask for an
  image in the desired size, with neither width nor height of -1. The
  thumbnailer will efficiently produce a thumbnail for that. (We do lots
  of internal caching to avoid extracting or downloading a thumbnail
  unnecessarily.)

  The thumbnailer may deliver a thumbnail that is smaller than what was
  asked for (because it never up-scales) so, if asked for a thumbnail of
  size 256, it's guaranteed not to be larger, but might be smaller (if
  the original image is smaller than what was asked for).

  Could you please adjust the shell behavior to ask for specific, valid
  sizes only?

  Running a tail -f on ~/.cache/upstart/dbus.log allows you to see the
  requests as they are made. Each request shows the size that was asked
  for.

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