boolean notVisible = firstLine > partialBottomIndex || lastLine < partialTopIndex; return !notVisible;
return !(firstLine > partialBottomIndex || lastLine < partialTopIndex);
boolean isAreaVisible(int firstLine, int lastLine) {	int partialBottomIndex = getPartialBottomIndex();	int partialTopIndex = verticalScrollOffset / lineHeight;	boolean notVisible = firstLine > partialBottomIndex || lastLine < partialTopIndex;	return !notVisible;}