Allow Actions in the Global Drawer to be disabled

[Marco Martin]

On Wednesday 10 February 2016 18:10:25 Dirk Hohndel wrote:
> This clearly was intentionally not supported - but I'm not sure I
> understand why - and I'd argue that this is a mistake. An application can
> have different states where some of the menu items should be disabled (for
> example, before an account is fully set up).
> 
> This simple patch allows that to work (and attempts to visualize the
> disabled state by reducing the opacity in that case).

yep, it was forgotten, you're right :)

it should also already reduce the opacity by itself when set disabled..
that's actually one of the things that ended up in the refactor, so it looks 
like i should hurry :)

-- 
Marco Martin