affix: should be reset placeholder size when trigger resize event

[cipchk]

Related

#2789

[zd5043039119]

@cipchk when you reset placeholder size when trigger resize, you will lost placeholder's height

  if (e.type === 'resize') {
      this.syncPlaceholderStyle(e);
    }

 private syncPlaceholderStyle(e: Event): void {
    if (!this.affixStyle) {
      return ;
    }
    this.placeholderNode.style.cssText = '';
    const widthObj = { width: this.placeholderNode.offsetWidth };
    this.setAffixStyle(e, {
      ...this.affixStyle,
      ...widthObj
    });
    this.setPlaceholderStyle(widthObj);
  }

in function "syncPlaceholderStyle", you clear the style of "placeholderNode" and then only set width of the node, then will lost the height, please fix it