bug#52973: Adding a few context-menu-mode commands

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: Eli Zaretskii <eliz@gnu.org>,  philipk@posteo.net,  52973@debbugs.gnu.org
> Date: Thu, 13 Jan 2022 07:03:33 +0100
> 
> Juri Linkov <juri@linkov.net> writes:
> 
> > For example, today while editing a shell script I needed to consult the
> > man page about the arguments of the command `zenity` used in the script.
> > It takes too many keystrokes to type `M-x man RET zenity RET'
> > or first to move point to this command, then to type `M-x man RET RET'.
> >
> > With the context menu, it's just one click: press the right mouse button
> > on the command name, select the item "Open man page", and release the
> > mouse button.
> 
> So it sounds to me like shell-script-mode (and derivatives and other
> shell-ish modes) should have the `man' bits of the context menu enabled
> by default?

The mode-based approach was what I proposed (and even thought it was
already implemented), but Juri seems to reject it.