This is a patch to use 'par_type' offsets to ownerParagraphs().begin() in LyXCursor.
The drawback is obvious: we have O(n) access in some cases where we had O(1) before. However,I have not seen _any_ indication that this is noticable after playing around with the UserGuide. In any case, the benefits seem to clearly outweigh this: LyXCursor is now 'copiable' and we can add asserts to the 'getPar()' set of functions to catch accesses to 'uninitialized' cursor data early. And we've lost a few dependency on ParagraphList_fwd.h. The patch will need a bit of polishing, but unless somebody objects on technical grounds I'll commit something similar soonish... [Note that the patch is sort of 'minimalistic' and we probably could make it nicer afterwards by accepting the offset in a few more places (like redoParagraph)] Andre'
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