Mixed QML/ CPP debugging: JavaScript/QML breakpoints display shadow-build files

[from 2nd part of test matrix section]:

• Create Qt Quick app and import samegame.qml as main QML file
• Place breakpoint on startNewGame in .js file
• Build with Debugging helpers
• Start debugging and hit New Game->Shadow build file is opened.

Note: Works for a mixed app with a generated main.qml