LayerSet: add retain & remove_empty_layers #285
Merged
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This is functionality I have a use for and can't implement anywhere except in the library, given
layers
is a private member ofLayerSet
I don't like that with
retain
I check every layer to see if its name matches the default, but there's no good way (without allocating) to 'skip one and then retain' that I'm aware ofSimple positive test case added for each method