twitter/bootstrap — pull request #7127 by poops (2013-03-03 22:41:22+00:00)
Title: Release control of arrow keys to application if typeahead menu is hidden

It doesn't seem like typeahead uses the left & right arrow keys, yet don't get passed back to the application when inside a typeahead div.

I think it also makes sense to pass back the up & down arrow keys if the menu is hidden, since typeahead only uses them when the menu is active.