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[Bug 1425043] Re: Thumbnails are returned one by one to QML thus already existing thumbnails can be blocked

To: ubuntu-sdk-bugs@xxxxxxxxxxxxxxxxxxx
From: Michi Henning <michi.henning@xxxxxxxxxxxxx>
Date: Thu, 16 Jul 2015 23:01:51 -0000
Reply-to: Bug 1425043 <1425043@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Changed in: thumbnailer
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1425043

Title:
  Thumbnails are returned one by one to QML thus already existing
  thumbnails can be blocked

Status in Thumbnailer:
  Fix Released
Status in qtdeclarative-opensource-src package in Ubuntu:
  Fix Released
Status in qtdeclarative-opensource-src package in Ubuntu RTM:
  Fix Released

Bug description:
  Thumbnail requests made via the QML thumbnailer image provider are enqueued and processed one by one which has some nasty UX consequences:
  1) if a thumbnail already exists it won't be returned immediately if other thumbnails are ahead in the queue
  2) video thumbnails are much slower to be generated so if one is being generated, all other thumbnails are blocked until it finishes

  This issue would be alleviated if not for https://bugreports.qt.io/browse/QTBUG-37988
  But even with the Qt bug fixed, 1) would still be an important issue in many cases

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