Fix for #999571, changes clone method
Fix for #999571, changes clone method

Instead of repainting, it just copies over the data array. Any reason
why this hasn't been used before? (Performance or otherwise?)

jakeclawson/Pinta,Fenex/Pinta,Fenex/Pinta,PintaProject/Pinta,jakeclawson/Pinta,PintaProject/Pinta,Mailaender/Pinta,Mailaender/Pinta,PintaProject/Pinta