[Bug 1450137] [NEW] Qt5 applications crash when switching screens

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# 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.

** Affects: qtdeclarative-opensource-src (Ubuntu)
     Importance: Medium
     Assignee: Timo Jyrinki (timo-jyrinki)
         Status: Confirmed

** Affects: qtdeclarative-opensource-src (Ubuntu Vivid)
     Importance: Medium
         Status: Confirmed

** Affects: qtdeclarative-opensource-src (Ubuntu Wily)
     Importance: Medium
     Assignee: Timo Jyrinki (timo-jyrinki)
         Status: Confirmed

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Qt5 applications crash when switching screens
https://bugs.launchpad.net/bugs/1450137
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