Keys for submitting part of the input as a command about rcloud HOT 3 CLOSED

We should find what's the standard in other places.

@s-u, what's the OS X R client behavior?

And what's the rstudio behavior? @smschauhan, do you know that?

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In the OS X editor <Cmd><Enter> executes the selection (if any) or the current line (if there is no selection).

In the OS X R command prompt <Alt><Enter> inserts a new line, everything else executes the entire content. You cannot execute a partial input at the prompt - multi-line execution is no different than line-by-line since there are no separate cells.

I don't think "a line at a time" makes sense in RCloud at the moment, because we don't support continuations - every evaluation has to be a valid expression.

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My only strong feeling is that the key should be different from what we are using to execute a cell, even though those situations are mutually exclusive (you can't execute part of a cell, and you don't need a special execute command in the input widget).

Right now we are using Command/Ctrl-Enter in the cells. So I'm putting execute-selection on Alt-Enter for the input widget for now. But I'll be happy to remap if we come up with a different scheme.

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