Initial version of the inline powerbox

[jparyani]

It's still a bit rough around the edges, but the basic functionality
works.

[dwrensha]

s/Faling/Failing/

[ocdtrekkie]

What is this PR in comparison to Sandstorm today, @zenhack? Should this be closed?

[zenhack]

It looks like this is a slightly different feature/design than what sandstorm currently has; if I'm reading the code correctly it shows an input just below the bottom of the grain frame, instead of a modal dialog floating over it. What I don't know is what the intent was here -- were folks expecting to have both UIs for some reason, or is this just obsolete? Is there a design doc somewhere?

@kentonv, any thoughts?

[kentonv]

The "inline powerbox" refers to the "autocomplete style" powerbox UI described in the roadmap.

I do think this style of powerbox is important in the long term. Many kinds of everyday interactions -- such as selecting recipients of an e-mail -- become cumbersome with a full powerbox, but could be made to feel almost normal using the inline powerbox, without sacrificing security.

However, implementing the inline powerbox is pretty hairy, since it requires communication between the app and the shell to capture keystrokes and decide where to render the overlay. I think we should focus on lower-hanging fruit for the time being.