The dialog is created with the context of the Page. When closing the
dialog, it starts to fade out, and then the page is popped (and
destroyed) before the dialog fade-out is finished. This makes the
context of the dialog invalid, and the ScriptAction that makes the
dialog invisible (and destroys it) is not executed. Because of this, the
dialog stays active (but with opacity 0) and blocks events from getting
to the active page.

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https://bugs.launchpad.net/bugs/1568016

Title:
  Freezes in uitk

Status in ubuntu-ui-toolkit package in Ubuntu:
  In Progress

Bug description:
  Ever since moving to uitk 1.3, I see occational freezes, mostly
  related to page push/pop operations. This happens very randomly but
  causes the app to freeze and requires a restart.

  I've triggered such freezes in many situations in all sorts of
  different apps but never could really reproduce it. There is
  definitely a race condition involved. Such freezes seem to happen most
  likely directly after app startup when pressing a button in the
  toolbar while stuff is still loading, but not only. I've also seen it
  happening in the middle of using an app.

  Now a friend of mine wrote an app and managed to get into a situation
  where it reliably triggers a freeze. I am not sure if this is the same
  as I'm observing or if its a different one. However, it is a freeze
  and might lead us to the real reason. Attached you'll find an archive
  that allows reproducing at least that one variant of the freeze.

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