Calculate number of levels as (maximal - minimal + 1) instead of taking levels size in case of gaps in levels numeration.

Author: EMaksymenko

worldwind/src/main/java/gov/nasa/worldwind/layer/LayerFactory.java

@@ -281,7 +281,7 @@ protected void createFromGeoPackageAsync(String pathName, Layer layer, Callback
                     tileMatrixSet.getMaxX() - tileMatrixSet.getMinX());
             config.tileOrigin.set(tileMatrixSet.getMinY(), tileMatrixSet.getMinX());
             config.firstLevelDelta = (tileMatrixSet.getMaxY() - tileMatrixSet.getMinY()) / tileMatrix.valueAt(0).getMatrixHeight();
-            config.numLevels = tileMatrix.size();
+            config.numLevels = tileMatrix.keyAt(tileMatrix.size() - 1) - tileMatrix.keyAt(0) + 1;
 
             TiledSurfaceImage surfaceImage = new TiledSurfaceImage();
             surfaceImage.setDisplayName(content.getIdentifier());