Cannot switch editors after debugging

1. Let the debugger hit a breakpoint in an open project.
   FWIW, I had it at the QApplication's instantiation in the "simple" debugger test.
2. Press F11 to "step into".
   Creator opens a new editor.
3. Press F11 to "step into" again.
   Creator opens another editor.
4. Press F5 and let the debugger finish.
5. Press Ctrl+Tab to switch editors.
   Nothing happens.

It should be possible to switch editors this way, because they are still open. As soon as I click into the currently open editor, Alt+Tab works again.