[Dune] [#276] adapt return value wrong

[Dune]

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FS#276 - adapt return value wrong
User who did this - Christian Engwer (christi)

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I know, I'm merely asking how to obtain the information, whether my grid has changed without iterating over the grid.

Although it is not the classic adaptation scenario, it is still a valid application:
- I want to coarsen my grid due to some local criterion, but not coarser than, e.g. level L.
- I loop through my grid and call mark, where ever a cell can be coarsened.
- If all child-cells are marked, the cell is actually coarsened.
- Even if the grid doesn't change any more, I'll usually still find cell, which might (in them self) be coarsened.

I see three options:
a) mark this as won't fix
b) change the behaviour of preAdapt() and make the return value exact (might be very expensive)
c) make the information somwhere else available (e.g. has-changed return value of postAdapt)

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