"OK" is misleading in error message from Designer

1. Open project tests\manual\qml\testprojects\dummycontext\dummydata.qmlproject
2. Open file main.qml (not the one in dummydata) in Designer.
   An error message appears.
3. Click "OK".
   main.qml won't be rendered correctly.

As thohartm explained to me, clicking "OK" means asking for error details instead of a rendering of the file. It's easy to get this wrong. I think the "OK" button should have a clearer label, e.g. "Error Details".