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Request: palette colour of uint32 domain with only 1 value of zero should not be white #1036

@jipclaassens

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@jipclaassens
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Onderstaand script resulteert in 1 polygoon, die vergrid wordt, dus polygon-id = 0

unit<uint32> Stichtse_Rotonde := select_with_attr_by_cond(NWB/Wegvakken, NWB/Wegvakken/STT_NAAM == 'Stichtse Rotonde')
, Descr = "hack om de Stichtse Rotondo nabij Amersfoort te identificeren. Zodat daarop niet gealloceerd mag worden. Buffer, dan dissolve, dan negatieve buffer."
{
	attribute<rdc_meter> geometry_buff0           (poly) := bg_buffer_linestring(geometry, 100d, 16b);
	unit<uint32>         union                           := geos_split_union_polygon(geometry_buff0);
	attribute<rdc_meter> geometry_buff1    (poly, union) := geos_buffer_multi_polygon(union/geometry, -100d, 16b);
	
	attribute<union>      Per_AdminDomain  (AdminDomain) := poly2grid(geometry_buff1, AdminDomain);
}

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UXImproved error messages, etc.dataViewMapview, tableview, layercontroltiny issueWork-load: probably tiny

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