isTailInclude method
检查屏幕语境是否包含尾屏
Implementation
isTailInclude(String singlePT){
if(tailColumnExpandAvailable){
var leftTail = PT_1;
var rightTail = '$column';
if(tailColumnExpand == TailColumnExpand.left && singlePT.contains(leftTail)) return true;
if(tailColumnExpand == TailColumnExpand.right && singlePT.contains(rightTail)) return true;
}
return false;
}