[dune-pdelab] Method gridView() in non-leaf GridFunctionSubSpace's

[Jurgis Pods]

Hi,

I have a question regarding the GridFunctionSubSpace in PDELab. I don't 
know if I understand it correctly, but the Power/Composite 
specializations do seem to assume that the father's gridview has the 
same type as their own gridview:

// get grid view
const typename Traits::GridViewType& gridView () const
{
    return pgfs->gridView();
}

This is reasonable for the PDE grid function spaces, as they have to 
have the same gridview when stacking them together. But when using 
dune-multidomain, the MultiDomainGridFunctionSpace in general does not 
have the same gridview as its childs. This leads to my question: Would 
it cause problems to change the methods gridview()/gridView() in the 
Power/Composite-GridFunctionSubSpace's to


// get grid view
const typename Traits::GridViewType& gridView () const
{
    return pcgfs->gridView();
}

, i.e. changing pgfs to p*c*gfs and refrain from using the father 
gridview? This is also how it is done for the leaf-specialization.
I am currently having huge problems creating those non-leaf SubGFS's for 
a MultiGFS and would be glad if I could simply change those methods 
without breaking existing code.

Cheers,
Jurgis

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