Problems with SetSnapRect() for rotated and/or sheared custom shapes

[Regina Henschel]

Hi all,

next steps in SetSnapRect().

Working on tdf#119191, I have noticed, that there the caller of 
SetSnapRect() assumes, that the shape shrinks/grows so, that it fits 
into its anchor cell. That works for a legacy rectangle, for example, 
but it does not work for custom shapes, which are rotated and/or sheared.

So there are at least two use cases, where SetSnapRect() is applied:
(1) Rescue a pos/size and apply it later.
(2) Fit a shape into a given rectangle.

SetSnapRect() is in most cases used in the form SdrObject->SetSnapRect() 
and the actual shape type is determined in last binding. So I think it 
is very error-prone to change SetSnapRect() now.

I have a different idea, that should work at least intermediately:
There exists the method AdjustToMaxRect()
https://opengrok.libreoffice.org/xref/core/include/svx/svdobj.hxx?r=7eb26ece#624
It would solve the use case (2). When ever there is a caller, that wants 
to fit a custom shape into a given rectangle, it can use 
AdjustToMaxRect() instead of SetSnapRect(). Later it would still be 
possible to move the calculations from AdjustToMaxRect() to 
SetSnapRect(), if someone wants to clear up the use of SetSnapRect().

I have now implemented AdjustToMaxRect() for custom shapes and changed 
two callers in sc to use this instead of SetSnapRect().

It would be nice, if you look, whether you like this idea.

The proposal is in https://gerrit.libreoffice.org/#/c/84216/.

Kind regards
Regina