macOS is identified as UNIX by CMake, but Qt doesn't actually use X11
there (and X11 support is not available by default anyway). Change the
condition that includes X11Extras to if (UNIX AND NOT APPLE) instead of
just if (UNIX) to mitigate that. This makes the build on macOS work
with CMake.
Co-authored-by: Christian Seiler <c.seiler@luxflux.de>
Pass header files to add_library() so they appear in the 'qtadvanceddocking' Visual Studio project.
Add path to header files in PUBLIC include build interface so the 'qtadvanceddocking' target can be built in-source in a CMake project.