If 'p_open' is specified for a modal popup window, the popup will have a regular close button which will close the popup. Note that popup visibility status is owned by Dear ImGui (and manipulated with e.g. OpenPopup). - *p_open set back to false in BeginPopupModal() when popup is not open. - if you set *p_open to false before calling BeginPopupModal(), it will close the popup.
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