visitable_needs_visiting

[Henrik Akesson <h.m.akesson@xxxxxxxxx>]

The two implementations of GeglVisitable always returns TRUE on calls to "visitable_needs_visiting" (see gegl-node:957 and gegl-pad:319).

It is used by gegl-visitor.c, but makes it more difficult to understand the code. 

Can I remove it?

Henrik
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