Allow to move cursor up and down in multiline editing?

[dragoncoder047]

In the Python prompt_toolkit (which is used by IPython) multiline editing mode, the history entry is only changed when the user presses 'up' with the cursor on the first line, or 'down' with the cursor on the last line. Anywhere else it just moves the cursor up or down. Can this be added?

The likely fix area would be somewhere around here:

https://github.com/wavesoft/local-echo/blob/8d0b7f55c5cf4b0b5f7c5132825dc5bd984bf017/lib/LocalEchoController.js#L484-L501