fix MapView, so tile provider can be accessible

add MapViewTileProviderBase::maximumLevel()

libs/map/mapview_tile_provider_osm.cpp

@@ -24,7 +24,7 @@ QString MapViewTileProvider_OSM::name() const {
 }
 
 
-bool MapViewTileProvider_OSM::requestTile(OSM::TileIndex index) {
+bool MapViewTileProvider_OSM::requestTile(MapViewTypes::TileIndex index) {
 	QNetworkRequest req(url + QString("/%1/%2/%3.png").arg(index.z).arg(index.x).arg(index.y));
 	req.setHeader(QNetworkRequest::UserAgentHeader, "Qt/5");
 	auto * r = nam->get(req);
@@ -51,6 +51,11 @@ QSize MapViewTileProvider_OSM::tileSize() {
 }
 
 
+int MapViewTileProvider_OSM::maximumLevel() const {
+	return 19;
+}
+
+
 void MapViewTileProvider_OSM::applyParameters() {
 	url = PI2QString(getParameters().childValue("url").toString());
 }