bug#13643: About symbolic prefix

[Stefan Monnier]

> In (info "(elisp) Active Keymaps"):
>    When the key sequence starts with a mouse event (optionally preceded
> by a symbolic prefix), the active keymaps are determined based on the
> position in that event.

> I don't know what the "symbolic prefix" means here (maybe it means
> something like `down-mouse-1'), but I think it doesn't mean the
> `gnus-symbolic-argument' in Gnus.  It is confusing here.

Good question.  Maybe this is referring to the case where the mouse
event is on a side element, in which case the key sequence starts with
`header-line', `mode-line', `left-fringe', ...


        Stefan