QML parsing does not update based on new files you drag into your project

I have a QML project with one file in it. In it I use the following non standard element Foo {}. The parser underlines the name Foo as unrecognised. I then drag a valid QML file into my project called Foo.qml. I drag this using the file system, not Creator. It shows up in the project tree, but Foo {} is still unrecognised in the open Editor. I have to close and reopen the editor to get it to recognise it.