[Therion] Lookup explo-date - avoiding overlying scraps

[Pavel Herich]

Hi,

do you see a way how to avoid certain scrap representation (by 
transparent imprint) in pdf as overlaying part of cave while using 
lookup (explo-date), as can be seen in the middle of map 
explo-date_1978.pdf?

explo-date_2024.pdf represents the whole cave, in blue is a cave passage 
discovered in 2024, which is overlaying discovery from 1978.

My point is to be able to show the cave as it was known before newest 
discovery, without signs of newer parts...

Many thanks
Pavel

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