Moc doesn't respect the relative path to the project directory

Project directory structure

|---other_project
|       QtWidgetsClass.h
|       
\---project
    \---sub-folder
            main.cpp
            MainWindow.h
            MOC-Issue.vcxproj            

Environment

• Visual Studio 19 - v16.6
• Qt 5.15.0 - msvc2019

Steps to reproduce

1. Create a Qt Widgets Application project in a two levels nested directory.
2. Right-Click on the project -> Add -> Existing Item... and select a Qt class that is two levels downwards in the directory hierarchy. 
3. Right-Click on the project -> Properties -> C/C++ -> General -> and add Additional Include Directories to the location where the Qt class is.
4. Compile and you will see that Moc generated the class in the wrong location, which will result for compilation failure.

Desired behavior

Moc should generate the moced-classes respectively under the $(OutDir)moc directory. 

Illustration

I attached the project files to reproduce this issue.

Thanks for the amazing work with MsBuild & Qt-VS-Tools!

Kind regards,

Gilad

See:

QTVSADDINBUG-756