OK I'll start with the Polish version and see how far I can get. I was a little disturbed when I saw this comment in the Modify Epub version:
Quote:
Originally this plugin tried to use a Container class used in the calibre source code. However having overriden so many methods to fix bugs or alter behaviour to suit my needs in the end I gave up on inheritance and copied.
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... but I don't suppose the current Polish version was around when Modify Epub was first written. Perhaps if kiwidude ever drops by this thread he'll shed some light.