The bug https://bugs.kde.org/show_bug.cgi?id=345544 linked from
https://bugreports.qt.io/browse/QTBUG-45753 (linked from
https://codereview.qt-project.org/#/c/111100/) has a claim from Stefan
that he doesn't see a particular crash anymore with Fedora's patched Qt.
The only relevant patch in that Fedora qtdeclarative seems to be this
same patch, so can maybe someone try to reproduce the crasher described
in that bug and then confirm it'd be fixed by the PPA?

That we way we could get at least one crasher fix in for starters.

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https://bugs.launchpad.net/bugs/1450137

Title:
  Qt5 applications crash when switching screens

Status in qtdeclarative-opensource-src package in Ubuntu:
  Incomplete
Status in qtdeclarative-opensource-src source package in Vivid:
  Confirmed
Status in qtdeclarative-opensource-src source package in Wily:
  Incomplete

Bug description:
  # Impact
  When switching screens (e. g. when putting the laptop onto the docking 
station the notebook screen is turned off and the external one is turned on) 
Qt5 applications (including plasmashell) quite often crash.

  # Test Case
  * Have two screens. One plugged-in one not
  * Run plasma 5
  * Plug-in second screen and wait 10 seconds
  * Unplug and wait 10 seconds
  * Plug-in and wait 10 seconds
  * Unplug and wait 10 seconds
  * ...

  # Regression Potential
  Worst case scenario an application using qquickscreen would slow down because 
of erroneous screen change singals being emitted too often per second. This 
would however only reveal a lower level issue in the foundations that 
ultimately needs to be fixed anyway. 

  # Other Info
  The upstream code review [1] explains the issue and solution pretty well.

  https://codereview.qt-project.org/#/c/111100/

  
  --------- original report ---------------

  When switching screens (e. g. when putting the laptop onto the docking
  station the notebook screen is turned off and the external one is
  turned on) Qt5 applications (including plasmashell) quite often crash.
  This makes my laptop unusable, since I do that very frequently.

  The problem has already been described here: 
https://bugs.kde.org/show_bug.cgi?id=341497
  Apparently it is fixed in Qt 5.5

  I am running Kubuntu 15.04 64bit and libqt5gui5 5.4.1+dfsg-2ubuntu4.

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