since there's no show/hide button in current xfce4-panel, so I add a show/hide button on panel, which, when clicked, will toggle panel's show/hide status, and for example, have panel hide to left corner or bottom corner. users can choose whether to have this button on panel in panel customization dialog.
Created attachment 1632 this patch add a show/hide button to xfce4-panel
Sry, but this use case makes no sense for me. How would you show the panel again after clicking the button? Also, we have various autohide modes now, so I consider this obsolete.