[PATCH] Introduce set_size_hints xdg_surface request.

[Jari Vetoniemi]

Relying only on maximized/fullscreen states to do tiling or hiding
decorations feels bit nasty, as for client developers it's documented
that fullscreen and maximized are indeed what they are. For example
fullscreen application such as video player could hide controls in
fullscreen mode, which is not desirable. These all would be relying on
implementation detail that could break if client developer did things
bit differently, but still according to documentation.

As for maximum size, only use case I could come up with it is for
widget sort of applications that are supposed to be certain size, but
I would not bet my life on its usefulness.

>We are working things on one step at a time. Jari was working on a tiling WM using the maximized state.

Yeah, I'll keep working on this more so we can pinpoint all the
problem points implementing tiling wms with the current interfaces.