Review Request 108913: remove explicit, but duplicated passing of parameters xmlWriter & mainStyles in Sheets*::saveOdf(...)

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This review has been submitted with commit de13040414342060e75a2f40efb4810ceca6ab71 by Friedrich W. H. Kossebau to branch master.

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On Feb. 11, 2013, 8:20 p.m., Friedrich W. H. Kossebau wrote:
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> (Updated Feb. 11, 2013, 8:20 p.m.)
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> Review request for Calligra and Marijn Kruisselbrink.
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> Description
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> It confused me when I read the code of saving a Sheet document to ODF:
> "KoXmlWriter& xmlWriter" and "KoGenStyles &mainStyles" are passed explicitly as parameters to Sheet::saveOdfColRowCell(...), Sheet::saveOdfCells(...), and Cell::saveOdf(...), even though they are already members of the also passed "OdfSavingContext& tableContext". By just looking at the method it seemed that xmlWriter and mainStyles were different objects to those which are part of tableContext, which has such objects via the shapeContext member. Only when going up the callstack it could be found that these references are just duplicates.
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> This confusion seems also the reason why in Cell::saveOdf(...) a shapeContext was recreated with these objects, instead of using the shapeContext of tableContext.
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> Attached patch changes the signatures of those methods to only pass "OdfSavingContext& tableContext", like also done in similar methods, and to simply create helper references to xmlWriter and mainStyles in the method bodies, as needed. It also removes the unneeded additional creation of a shapeContext.
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> Resulting code should be less confusing :)
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> (Came across the code during of my currently done big tuning of KoOdfWriteStore)
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> Diffs
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>   sheets/Sheet.cpp 1b11a6f 
>   sheets/Sheet.h 9d9f1a7 
>   sheets/Cell.cpp fef7846 
>   sheets/Cell.h 015e847 
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> Diff: http://git.reviewboard.kde.org/r/108913/diff/
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> Testing
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> all Sheets tests pass as before, richtext in cell roundtrip also worked
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> Thanks,
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> Friedrich W. H. Kossebau
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