bug#9054: [External] : bug#9054: 24.0.50; show source in other window

[martin rudalics]

> All I do is check whether there is such a thing-at-point.
> If not, I don't enable the menu item for acting on that
> kind of thing-at-point.

If the thing-at-point is nowhere defined, its context menu should not
show an entry for going to the definition of the thing-at-point.  If the
thing-at-point has no manual entry, its context menu should not show an
entry for looking up the manual entry for the thing-at-point.  Ideally.
Unfortunately, it sometimes may be too time consuming to tell on the fly
whether the thing-at-point is defined and/or has a manual entry.

martin