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When rendering the main map the holes (islands with no specific content) in river and lake water objects are displayed in the land/light-grey colour. Are these holes rendered or we just see the background through the holes? |
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if the water object is a multipolygon and the "islands" are set as inner objects, they will render. Note at higher zooms(12,13) it takes a lot longer to refresh on the main OSM map. |
I guess this depends on the renderer and/or rendering setup. Some might choose to display water as background, some others might choose to display land by default.