- Add dgi and vgi at the beginning, and use show()/hide() instead of
addItem/removeItem.
- Merge connectActions() into MainWindow's constructor. That is clearer
like that.
- Add comments in the constructor.
- Rewrite the two action handlers aboutCGAL and aboutDemo: use html file
in a resource. That works! The "About CGAL" dialog now has a big shiny
CGAL logo! :-)