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[Daniel d'Andrada <daniel.dandrada@xxxxxxxxxxxxx>]

@fboucault This is option 1.

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https://bugs.launchpad.net/bugs/1364009

Title:
  [Spread] A continuously growing number of dead applications in the
  spread use more and more memory

Status in Ubuntu UX:
  Fix Committed
Status in unity8 package in Ubuntu:
  New

Bug description:
  What should we do when there's a large number of dead applications
  (automatically killed due to out-of-memory situations) in the spread?

  Option 1 - Keep them all in the spread

  We must them unload those app screenshots (move them to disk) to save
  memory. If the user has a lot of dead apps in the spread, even though
  the apps themselves are not taking up memory space anymore, their
  respective screenshots in the spread still do.

  So oldest of those dead apps that are not being displayed on the
  spread should have their screenshot images unloaded and saved to disk.
  If the user then scrolls the spread making them visible again they
  should be loaded back from disk.

  There's the risk that if the user is flicking too fast down to the
  oldest apps, he might see screenshots popping in as they're reloaded
  from disk.

  Option 2 - Automatically remove the oldest dead ones

  Simpler to implement and there's no risk of running into the "texture pop in" situation described above.
  It also save the user the burden of manually removing apps he doesn't care anymore and probably forgot about long ago.

  -----------------------
  Desired solution:

  Option 1 with upper limit value 100. See the reasoning from comment
  section below.

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