add:  if (propOldValue) { var vOpener = this.getOpener(); if (vOpener) { vOpener.setState(null); }; }; 
context: proto._modifyVisible = function(propValue, propOldValue, propName, uniqModIds){  this.setHoverItem(null);  this.setOpenItem(null);  return QxWidget.prototype._modifyVisible.call(this, propValue, propOldValue, propName, uniqModIds);};
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