setLeftRightMargins method
Implementation
@override
void setLeftRightMargins(int left, [int? right]) {
if (!_leftRightMarginMode) return;
final effectiveRight = right ?? viewWidth - 1;
if (left >= effectiveRight) return;
_buffer.setHorizontalMargins(left, effectiveRight);
_buffer.setCursor(0, 0);
}