Adds a separator (typically drawn as a straight line) to an already existing popup or
nested popup named <popupname>. If you want to add an item to a nested popup, use the form
"popup.item", for example, "channeltextview.myNestedItem". The separator is not selectable
or clickable.
<item_id> is the optional item id - if not specified, it will be generated automatically.
If <condition> is given, it is evaluated at popup.show call time and if the
result is 0, the item is not shown in the physical popup.
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