Hi
There are for example use cases when you add a custom stylesheet to be able to edit quickly any ebook. Once the work is done, once the unused rules have been deleted, you may wish to unify and clean the style sheet.
We already can do it joining together two different stylesheet using the Calibre Editor. To day, this is done mainly putting the text of the second one under the text of the first one. However the end result usually looks like a mess even if it's not...
If some kind of sorting allows you to detect duplicates, I think it will be a progress. It will be useful practically even if it can trigger 0.001% of mistakes of the kind you referred to.
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