vis: change key input handling model

Previously if you had a mapping for both `a` and `ab` the latter would
in effect be unreachable because the greedy search would always match
and then execute the former. With the new behavior we keep reading keys
until we have a non ambigious sequence. That is after pressing `a` nothing
will happen, if the next key is a `b` we will execute the `ab` mapping
otherwise we will perform `a` and whatever the action is for the next key.

Close #386

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