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Alejandro Garcia Montoro authored
The previous code misbehaved when calculating longitude lines labels. Passing the longitude as a qreal to lonToString make that some lines get their zone label wrong (e.g., when passing -114, the function received -114.00000001 and returned the zone associated to [-120,-114[, not the one associated to [-114,-108[; i.e., it returned 11 instead of 12. The current code avoids this problem passing the longitude increased in 3 degrees (i.e., it does not pass the limit of the zone interval but the middle of it)
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