"Close All" is disabled although files are open

1. Open a file.
2. Click into the QML Profiler's, Timeline view.
3. Click into the Projects view.
4. Open the File menu.
   Creator seems to have lost track of the open file. Menu entries like "Save As..." and even "Close All" are disabled.

Whenever a file is open, "Close All" should be enabled. The other menu entries should reflect the current state, too.