As the default QMenu creates several issues especially on Mac, we replace it by our own menu, completely implemented using custom widgets. It should provide the following features:

• filter module list
• provide most recently used modules for direct access
• provide most often used modules for direct access
• optional: provide module documentation on mouse hover?
  • this heavily depends on the time needed to render the module doc html in Qt.

(from redmine: created on 2013-03-27, relates #121 (closed))