separation of concernes in TileScalingTextureMapper: factor out clearing of pixmap cache
separation of concernes in TileScalingTextureMapper: factor out clearing of pixmap cache

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