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new file -- clipboard.c
Copy layer -> layer address
on paste, layer_copy_func in Interface. returns new layer with new data, etc.
-- items --
if selected thing something to be copied call
layer_copy_item_func
then
layer_paste_item_func
If same layer is selected.
The only problem is determining if selected item can be copied.
No, wait, piece of cake. Hand back sublayer_type to the layer in a new interface func
gboolean layer_sublayer_is_copyable_func ( sublayer_type )
to determine if copyable
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