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Pin location seems like changing when zooming out #13

Description

@jerzykiler

I've found a bug in all versions from 1.0.1 above (including 1.1.0).

In version 1.0.0 it is working fine.

I am adding a Pin like that:

    internal fun addPin(lat: Double, lon: Double) {
        if (pins == null)
            pins = Pins(this)

        if (imageGroup == null) {
            imageGroup = GLMapImageGroup(pins, 3)
            mapView.add(imageGroup)
        }

        val pin = Pin()
        pin.pos = MapPoint.CreateFromGeoCoordinates(lat, lon)
        pin.imageVariant = 0
        pins!!.add(pin)
        imageGroup!!.setNeedsUpdate(false)
    }

Pin(lat = 52.2117947426 lon = 20.981752462)

It's easy to see in relation to this box in geojson:

[
{
  "type": "Feature",
  "id": "way/-130506",
  "properties": {
    "id": "way/-130506"
  },
  "geometry": {
    "type": "Polygon",
    "coordinates": [
      [
        [
          20.98182189335,
          52.21173087973
        ],
        [
          20.98182199255,
          52.21188518947
        ],
        [
          20.9817045864,
          52.21188521781
        ],
        [
          20.9817044872,
          52.21173090807
        ],
        [
          20.98182189335,
          52.21173087973
        ]
      ]
    ]
  }
}
]

When I zoom in and out it seems like the Pin moves on the map, like its position changes.
It seems like the layer on which the Pin is drawn is not updating at the same scale as the map layer underneath.

Also the initial placement of the Pin looks different between version 1.0.0 and above versions.

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