The Describe Properties item runs describe-text-properties,
which always references (the character after) point, never a
region. Since it references a single position, to me the best
position to use is the mouse-pointer position (when run from
the mouse popup menu). If the mouse pointer does not point to a
character, then an error message should say "No character here"
or some such.
To be clearer, this is the kind of behavior I would propose for Text
Properties > Describe Properties:
(defun describe-props-at-mouse (event)
"Describe text properties of character under the mouse pointer"
(interactive "e")
(save-excursion
(set-buffer (window-buffer (posn-window (event-end event))))
(goto-char (posn-point (event-end event)))
(describe-text-properties (point))))
The error you get if you point to something other than a character is this:
"No character follows specified position".
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