do not re-merge tiles when requesting reload of visible tiles
do not re-merge tiles when requesting reload of visible tiles

Re-merging does not make sense here since the tile updates are not yet available at this point.
When updates are available, they will be handled by StackedTileLoader::updateTile().

AndreiDuma/marble,quannt24/marble,AndreiDuma/marble,tucnak/marble,utkuaydin/marble,adraghici/marble,quannt24/marble,probonopd/marble,rku/marble,tzapzoor/marble,Earthwings/marble,tucnak/marble,probonopd/marble,rku/marble,Earthwings/marble,David-Gil/marble-dev,AndreiDuma/marble,adraghici/marble,tzapzoor/marble,David-Gil/marble-dev,Earthwings/marble,quannt24/marble,Earthwings/marble,oberluz/marble,probonopd/marble,utkuaydin/marble,David-Gil/marble-dev,AndreiDuma/marble,tzapzoor/marble,tucnak/marble,tzapzoor/marble,oberluz/marble,rku/marble,adraghici/marble,David-Gil/marble-dev,adraghici/marble,oberluz/marble,Earthwings/marble,rku/marble,probonopd/marble,quannt24/marble,tucnak/marble,Earthwings/marble,quannt24/marble,tucnak/marble,David-Gil/marble-dev,utkuaydin/marble,oberluz/marble,rku/marble,oberluz/marble,tucnak/marble,probonopd/marble,oberluz/marble,quannt24/marble,utkuaydin/marble,AndreiDuma/marble,quannt24/marble,utkuaydin/marble,AndreiDuma/marble,tzapzoor/marble,tzapzoor/marble,probonopd/marble,tzapzoor/marble,David-Gil/marble-dev,utkuaydin/marble,rku/marble,tucnak/marble,probonopd/marble,tzapzoor/marble,adraghici/marble,adraghici/marble