Re: gtkmm: Pixbuf::get_pixels()

The copy is done as follows, to support copy-on-write:

 * This function will cause an implicit copy of the pixbuf data if the
 * pixbuf was created from read-only data.

I thought as long as the apparent functioning of the object is still the same to external users, then it is allowed to make internal changes even on a const instance? Using mutable members.

If so, then maybe it would still be OK to wrap that as a const method.

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