Among the systems we officially support, the oldest Qt version is Qt 5.9
on Ubuntu 18.04. Fractional scaling is supported in Qt 5.6 and newer. We
should be able to safely remove these ifdefs.
AllDockWidgetFeatures is now deprecated. Use underlying values instead.
Use default QFlags constructor instead of nullptr/0.
Use QWheelEvent::angleDelta() in place of orientation() and delta(), and
position() in place of x() and y().
Code submissions have continually suffered from formatting
inconsistencies that constantly have to be addressed. Using
clang-format simplifies this by making code formatting more consistent,
and allows automation of the code formatting so that maintainers can
focus more on the code itself instead of code formatting.
