Martin Heistermann authored Aug 12, 2020 and Jan Möbius committed Aug 12, 2020

Single configuration generators on Windows (e.g. nmake) didn't get the
correct include path for autogenerated headers from .ui files.

Multi-configuration generators (e.g. MSVC) only worked in an incomplete
subset of build types.

While AUTOUIC automatically sets include directories for the target,
these only seem to be PRIVATE include dirs, leading to failure when
trying to use them from other projects than where the .ui file lives.