bug#50552: 28.0.50; Add context-menu-occur

[Juri Linkov <juri@linkov.net>]

> the below patch adds the commands occur-word-at-mouse and
> occur-symbol-at-mouse, and a function for context-menu-mode to occur
> words or symbols where the context menu was invoked.
>
> Would there be any interest in adding such a functionality?

Thanks.  There is a new function 'thing-at-mouse' with a new arg 'click'
added today that you can use instead of 'thing-at-point'.
You can see an example in lisp/net/dictionary.el.

> diff --git a/lisp/mouse.el b/lisp/mouse.el
> index 7d3ed9a0e4..3590e27e3e 100644
> --- a/lisp/mouse.el
> +++ b/lisp/mouse.el
>[...]
> +(defun context-menu-occur (menu)

The default set of context menus in mouse.el contains only menus
created from the existing non-context menus.  All new context menus
should be added to their respective packages.  So please move
context-menu-occur to replace.el.

Another example prog-context-menu in lisp/progmodes/prog-mode.el also
demonstrates how context menus should belong to the package where they
are used.  And prog-context-menu is similar to context-menu-occur,
so it should have the name prefix of the package: occur-context-menu.