[libxkbcommon] Pull request - many changes

[wettstein509 at solnet.ch]

> Ah.  Well, the plan is to extend libxkbcommon to allow more than four
> groups - this is already mostly done.  XI2 already supports higher
> groups, so the bulk of the work would be in fixing the XKB wire
> protocol.

As long as redirect actions remain supported, this will indeed remove
the need for overlays.  I am a bit pessimistic about the time it takes
for such enhancements to be supported by applications (about one year
ago, I still had to work with an XKB unaware application...)

> Interesting - which problems does this cause exactly?

In xterm, for example, when you press Shift+the key that has KP_Add on a
higher level (for example, on Level 5 as in de(neo)), it will increase
the font size, rather than entering the character.  This is not a bug,
it is just a loose definition of default keybindings, and can be fixed
in the Xresources.  But there are other Xt applications with similar
problems.

Andreas