Review Request: Fix wrong position calculations in AbstractSelectionStrategy, SelectionStrategy and DragAndDropStrategy

[Sebastian Sauer]

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http://git.reviewboard.kde.org/r/102517/
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Review request for Calligra, Marijn Kruisselbrink and Stefan Nikolaus.


Summary
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This fixes a crash when selecting cell after creating a chart ( bug https://bugs.kde.org/show_bug.cgi?id=279951 ).

This patch is rather essential and changes how selections are translated to a range of rows and columns. Before we did;

    const KoShape* shape = tool()->canvas()->shapeManager()->selection()->firstSelectedShape();
    const QPointF position = documentPos - (shape ? shape->position() : QPointF(0.0, 0.0));

and now (with this patch) we do;

    const QPointF position = documentPos;

What means we don't try to take the position of the first selected shape into account any longer. That seems to work
great, fixes bug 279951 and also gets right of a few other asserts (e.g. select C3 and keep the mouse to expand the
selected range to A1 and go a bit future to have also the header in the selection => assert).

The push that added the firstSelectedShape() to Tables (back then KSpread) was commit 2afef0a9;

    Author: Stefan Nikolaus <stefan.nikolaus at kdemail.net>  2008-06-14 12:40:03
    Committer: Stefan Nikolaus <stefan.nikolaus at kdemail.net>  2008-06-14 12:40:03
    Parent: 781ac3926d0e6224d4547cb5041041f66c4ecd97 (* New, updated TODO list managed using emacs' org-mode)

    Cell Tool	Switch to strategies for the mouse interaction.
    		Drag'n'drop is special cased.

I tried to compile that revision to check if the bug was present but seems I get interesting compile-errors related
to undefined QString, KGlobal, etc. Maybe cause 2008 we where building still against Qt3? Or against a moving kdelibs
(aka the KDE4-port)? Not sure there but also later revisions fail to compile... I didn't went future cause since that
particular commit *lot* of refactoring happens and it can also be the case that one of the many refactorings like
e.g. commit 3fcae916 did break it. I wouldn't wonder...


Diffs
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  tables/ui/AbstractSelectionStrategy.cpp f5982f9 
  tables/ui/DragAndDropStrategy.cpp f500b5a 
  tables/ui/SelectionStrategy.cpp 8844e47 

Diff: http://git.reviewboard.kde.org/r/102517/diff


Testing
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I tested various drag and drop and selection cases and they all still seem to work as expected. Also it fixes bug 279951 .


Thanks,

Sebastian

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