This is to document the process of messing up with internals of Sigil - for all ignorants like me who don't know better - to show how it should be done. Or how it should not be done. Whatever. Time will show.
I sort of pledged myself to do something about
issue 218 and to entertain/inspire/warn you I will try to describe the process as far as it goes.
First: the development environment. I'm using QtQreator (comes with Qt and has a good online help) in Ubuntu 14.04/64.
So let us start QtCreator.
to be continued...?