fill method
Fills the entire buffer with a copy of cell.
Implementation
@override
void fill(Cell cell) {
for (var y = 0; y < bounds.height; y++) {
for (var x = 0; x < bounds.width; x++) {
final targetCell = parent.getCell(bounds.x + x, bounds.y + y);
if (targetCell != null) {
targetCell.char = cell.char;
targetCell.style = cell.style;
}
}
}
}