bug#11680: flyspell should use mouse-3 instead of mouse-2

[Drew Adams]

> In the future, a more general option would be preferable
> that would enable using the right mouse button to pop up
> context menus in more places in Emacs like most other apps do
> nowadays, i.e. something like cua-emulation mode but for mouse-3.

(Caveat: I haven't followed this thread, at all.)

But if `mouse-3' behavior that allows for context-specific
popup menus is what's sought, then `mouse3.el' fulfills
that need, and with a great deal of flexibility.  This has
been the case since 2010.

Not only does it provide for context menus, but it does so
without sacrificing the other useful vanilla `mouse-3'
behaviors, which are also useful.  It adds to, instead of
replaces, existing `mouse-3' behavior.  It's compatible
with what Emacs users expect in general for `mouse-3'.

https://www.emacswiki.org/emacs/Mouse3

https://www.emacswiki.org/emacs/download/mouse3.el