[Tile-serving] [openstreetmap/mod_tile] render_list multi threading is not working, it seems (Issue #405)

[ldeffenb]

@pkthogit   I did a similar optimization on higher zoom level tiles by looking at the next lower zoom level tile and not rendering any of the 4 higher zoom tiles if the lower zoom tile was a single color, be it water, desert, or ice.   But then, my application also runs a leaflet extension that automatically fetches and stretches a lower-zoom level tile piece if the current zoom is not found.   It does this recursively, so if a single zoom 5 tile is all one color, every zoom higher than that actually uses bits of that single tile.


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