Image files can't be shown in Quick project, missing in qrc

1. Create a new Qt Quick Application project.
2. Open the project's qml file in Design mode.
3. Drag an Image item into the GUI.
4. Select an image file to show in the Image item.
5. Run the project.
   The image file won't be shown because it was not added to the project's qrc file:

   qrc:///main.qml:21:5: QML Image: Cannot open: qrc:///Screenshots/5.png
   

When selecting an image file, Creator should offer to add this file to the qrc file and, if needed, copy it.