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[Brian Murray <brian@xxxxxxxxxx>]

** Changed in: variety (Ubuntu Yakkety)
       Status: Incomplete => Won't Fix

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https://bugs.launchpad.net/bugs/1494992

Title:
  100% CPU when the History or Wallpaper Selector panels are open

Status in Variety:
  Fix Committed
Status in variety package in Ubuntu:
  Fix Released
Status in variety source package in Xenial:
  Incomplete
Status in variety source package in Yakkety:
  Won't Fix
Status in variety source package in Zesty:
  Fix Committed
Status in variety source package in Artful:
  Fix Released

Bug description:
  Version:0.5.4
  DE:Cinnamon 2.6.13
  OS:Linux Mint 17.2

  When you chnage the backgroud in the history panel or scroll in it the CPU utilisation goes up to 100% and stay there.
  I need to close the panel and reopen it to restore the utilisation back to normal.
  The problem seem also to be in the download history panel and the selection of background too.

  ----

  Below is the SRU information by James Lu
  (https://launchpad.net/~tacocat)

  [Impact]

   * The autoscroll feature in Variety's Wallpaper Selector dialog
  before commit
  https://bazaar.launchpad.net/~variety/variety/trunk/revision/592
  consumes excessive amounts of CPU after leaving the autoscroll area.
  This affects both the "History" and "Wallpaper Selector" options found
  in Variety's menu.

   * Although this bug doesn't cause any serious damage, pegging a
  machine's CPU is quite annoying and users will notice whirring fans
  and reduced battery life as a result.

   * The proposed fix adds a missing line to clear the autoscroll state
  when leaving the wallpaper selector. This way, the code in
  _autoscroll_thread() (which polls for whether the mouse is over the
  wallpaper selector) doesn't instantly succeed and create an infinite
  loop.

  [Test Case]

   1) Select one or more wallpaper sources so that in the Wallpaper
  Selector, scrolling is needed to show all items.

   2) Open the wallpaper selector, either by focusing on a wallpaper
  source in the preferences dialog, or by choosing the "Wallpaper
  Selector" option in Variety's tray menu.

   3) Move the mouse over any of the images in the wallpaper selector.

   4) Move the mouse away from the wallpaper selector. A CPU spike in Variety should appear now.
     - Note that this CPU spike is different from any initial CPU spikes when the wallpaper selector first opens, as that is due to Variety generating all the thumbnails on the spot. The CPU spike mentioned in this bug lasts as long as the wallpaper selector is open and the mouse is not over it, while the initial spikes are temporary (they always last less than 5 seconds for me)

  [Regression Potential]

   * This patch affects the autoscroll portion of the wallpaper
  selector. Should this patch be erroneous, some symptoms could include
  autoscroll or the entire wallpaper selector not working entirely.

   * Syntax or variable name errors will, on the other hand, raise
  Python exceptions and possibly cause Variety to fail to start
  entirely.

  [Other Info]

   * The original patch fixing this bug was included in Debian release
  0.6.3-5, which has been in Debian stretch for about 2 months and
  artful for a similar time (I don't remember the exact date of the
  relevant sync). No new bugs related to this issue have been opened
  since in Debian and Ubuntu.

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