Switching to other window inserts code

1. Open a source file in Creator.
2. Type "class".
3. Press Ctrl+Space.
   A list of proposals will show up.
4. Try switching to a different window using Alt+Tab.
   The code from the current proposal will be inserted into the editor. Creator will remain the active window.

Instead, the list of proposals should be closed, the contents of the editor should not change and a different window should become active. On Windows, this seems to work correctly.