[CMake] .ui Files are listed under the _autogen target in Visual Studio instead of the target to which they belong. Is this a bug or feature?

[Ulrich Hierl]

Hello cmake community,

I have a project that uses Qt 5.9.1 and cmake 3.12.4 and Visual Studio 
2017. I have targets for which I use

set(CMAKE_AUTOMOC ON)

I do not use CMAKE_AUTOUIC or CMAKE_AUTORC

Switching the CMAKE_AUTOMOC option on causes the <target>_autogen 
targets to be created. My problem is that in the Visual Studio solution 
explorer the .ui files are listed in the _autogen target and not in the 
target to which they belong. Can you reproduce this behavior? I this how 
it should be?

Thank you for your time!

Knitschi