[neon] [Bug 362767] High DPI is messed up after Qt 5.6 update

[David Edmundson via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=362767

--- Comment #5 from David Edmundson <kde at davidedmundson.co.uk> ---
For Case #1:
 - qt now scales up font DPI for some reason, you can counter that by
explicitly also setting
QT_FONT_DPI to be half/double (not sure which way round it is) 

For Case #3

Since Plasma 5.5 we do have code to disable internal high DPI managing on Qt5.6

However, it requires kwin/plasma also be *compiled* with Qt5.6

#if (QT_VERSION >= QT_VERSION_CHECK(5, 6, 0))
    QCoreApplication::setAttribute(Qt::AA_DisableHighDpiScaling);
#endif

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