Žiga Černigoj

tilerow = -Math.round((nw.y - Y0) / tilewidth) computes wrong value for what should result in tilerow=0

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When computing tilerow number for the first row, the result of `let tilerow = -Math.round((nw.y - Y0) / tilewidth);` is 1 instead of 0 if using too "big" precision for...