testRemoveLines method
Implementation
int testRemoveLines({int? width}){
if(data.isEmpty) return -1;
for(var y = 0; y<= size().y; y++){
if(List.generate(width ?? size().x + 1, (x)=>(x: x, y: y)).every((pos)=>isNotBlank(pos))){
return y;
}
}
return -1;
}