Probbably need to update overflown classname. #56
Description
If Popup has placement with overflow options, it changes className once to overflown, but does'nt switch back if overflownot needed.
E.G. : We have rc-select dropdown menu with 'bottomLeft' placement. If there is no place on screen popup className would be set to topLeft.
In onAlign function you only check if alignClassName !== currentAlignClassName, but I guess, you should also check if this.currentAlignClassName !== currentAlignClassName
onAlign = (popupDomNode, align) => {
const props = this.props;
const alignClassName = props.getClassNameFromAlign(props.align);
const currentAlignClassName = props.getClassNameFromAlign(align);
if (alignClassName !== currentAlignClassName) {
this.currentAlignClassName = currentAlignClassName;
popupDomNode.className = this.getClassName(currentAlignClassName);
}
props.onAlign(popupDomNode, align);
}