return all code actions in a selected range
return all code actions in a selected range

Summary:
if you highlight a range and hit `cmd+.` in vscode, it triggers a codeAction request for all of the diagnostics within that range.

since we use `Loc.contains`, we only return code actions for errors that your cursor is inside, not around. using `Loc.intersects` instead fixes it.

Reviewed By: gkz

Differential Revision: D26433664

fbshipit-source-id: 6c0e1754ad17bca257053475388d349cc92dedf4

mroch/flow,facebook/flow,facebook/flow,facebook/flow,mroch/flow,mroch/flow,facebook/flow,facebook/flow,mroch/flow,mroch/flow,facebook/flow,mroch/flow,mroch/flow,facebook/flow