Hi Martin,
r39814 broke native vector support because boundaries were not copied,
even if they belonged to an area with a cat in the given layer. Fixed in
39975 and 39976. Please make sure that OGR support does not interfere
with native vector support;-)
The behaviour of v.clean calling the new Vect_copy_map_lines_field() is
a bit unexpected because this is like first extracting all features in a
given layer, then cleaning the extracted features. I think the purpose
of v.clean is to do topological cleaning, and in a grass vector all
features of all layers are topologically linked, thus I would by default
always copy all lines of all layers, as in grass6.
I thought about a layer and a where option for v.clean, but not for
extracting, all features would be copied, but only selected features
would be cleaned, but that means rewriting most cleaning functions...
Best,
Markus
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