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[Timo Jyrinki <timo.jyrinki@xxxxxxxxxxxxx>]

There's a WIP code being worked on by upstream now:
https://codereview.qt-project.org/#/c/142309/

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https://bugs.launchpad.net/bugs/1460970

Title:
  DeferredDelete events not handled in time when created by GLib
  dispatched events

Status in qtbase-opensource-src package in Ubuntu:
  Confirmed

Bug description:
  DeferredDelete events are handled only for the main loop "level" that
  object->deleteLater() was called in. Events dispatched directly from
  GLib don't pass through qt's dispatching, thus getting a level of 0,
  which means that they aren't handled until the program exits (i.e., as
  long as level 0 exists).

  This is causing apparent memory leaks in long-running applications.
  We're working around this by using queued signal connections or
  calling sendPostedEvents(). For example in

      https://code.launchpad.net/~lukas-kde/gsettings-qt/queued-
  processing/+merge/259883

  Upstream: https://bugreports.qt.io/browse/QTBUG-32859

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