Insert mode - point doesn't move to next line

[aditya siram]

I'm having an issue with the master branch where the cursor in Insert
mode doesn't always move to the next line with Return or Ctrl-J. I can
reproduce this in the following way:
1. open a new buffer with `:new`
2. Go into Insert mode with `i`.
3. Type `hello world`
4. Hit Enter, the cursor goes to the beginning of the line just typed
and not the next line.

This also happens intermittently in eshell where when I enter a
command like `ls` the cursor moves to the beginning of this line
rather than the prompt that comes up after the output.

Thanks ...
-deech