[QGIS-Developer] QgsSpatialIndex nearestNeighbor returns more than 1 feature

[matteo]

Hi all,

Using nearestNeighbor of QgsSpatialIndex, even with the flag 
FlagStoreFeatureGeometries, sometimes I got more than 1 feature related 
(distance between the features is not the same, I've manually checked).

Is there a way to return only the nearest feature?

Cheers and thanks

Matteo