Steps to Reproduce

open a popup with (type toggle) and close it by clicking the button again.

https://zkfiddle.org/sample/34ft7km/1-Toggle-Popup-not-closing-simplified

<zk>
  <button label="Button (toggle popup with onOpen)" popup="examplePopup, type=toggle"/>
  <button label="Button (toggle popup without onOpen)" popup="examplePopup2, type=toggle"/>
  <popup id="examplePopup" onOpen="">
    <label value="example popup"/>
  </popup>
  <popup id="examplePopup2">
    <label value="example popup"/>
  </popup>
</zk>

Current Result

a popup with an onOpen-listener reopens immediately after clicking

(closes on mouse-down and reopens again on mouse-up)

Expected Result

possibility to toggle close a popup (and handle onOpen events)

Debug Information

some more information provided in the forum
https://forum.zkoss.org/question/112509/toggle-popup-not-closing/

Workaround