[STUMP] Tab searchable menus

[Chris Kelly]

Hi all,

I've added some code to the latest menu.lisp to do the following:

- highlight the letters being searched for where they appear in the menu
- tab cycles search results
- backspace deletes characters from the search

I've (temporarily?) disabled jJ kK keybindings in the patch although I
really think it is better if there is a search feature at all not to
have searchable letters reserved for navigation. However, the patch
will still work with j/k keybindings at least as well it does now and
otherwise all keys work exactly as they did. Perhaps requiring the
user to type '/' before search could be a good compromise?

This is my first contribution and I'm not the worlds greatest lisp
programmer, so all comments/advice are welcome and please let me know
of any style errors or bugs I should fix.

Regards,
/Chris Kelly

tab-searchable-menus.patch
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