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[FEATURE] Union algorithm for single layer
Resolves all overlapping geometries just like GRASS or Arc do. So now we have two variants of union: - union(A) - does union within geometries of one layer - union(A,B) - does union between geometries of two layers For union(A,B) algorithm if there are overlaps among geometries of layer A or among geometries of layer B, these are not resolved: one needs to do union(union(A,B)) to resolve all overlaps, i.e. run single layer union(X) on the produced result X=union(A,B) This should also address issues raised in #17131
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