File System View: Files above project file are not displayed for project

1. Open the llvm/clang project (mono repo) as described in QTCREATORBUG-22593
2. Open the file system view, select the LLVM project from the drop-down at top.

It shows the contents of llvm-project/llvm as CMakeLists.txt resides there. But the clang subproject llvm-project/clang is not visible (but included in the build...) in this view.

Suggestions:

• Consider setting the nearest parent/ancestor as root dir of all source files of the project so that llvm-project becomes the root directory of the LLVM View instead of llvm-project/llvm.
• And/or, allow opening a custom directory in that view as Visual Studio Code does.