[Merge] lp:~dandrader/qtubuntu/logicalDpi into lp:qtubuntu

[Lukáš Tinkl]

And btw, looks like all other platform QPAs use roughly this code for logicalDpi():

458	QDpi QXcbScreen::virtualDpi() const
459	{
460	    return QDpi(Q_MM_PER_INCH * m_virtualSize.width() / m_virtualSizeMillimeters.width(),
461	                Q_MM_PER_INCH * m_virtualSize.height() / m_virtualSizeMillimeters.height());
462	}

https://code.woboq.org/qt5/qtbase/src/plugins/platforms/xcb/qxcbscreen.cpp.html#_ZNK10QXcbScreen10virtualDpiEv
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https://code.launchpad.net/~dandrader/qtubuntu/logicalDpi/+merge/320940
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