Bash inside Vim not working properly

[GoogleCodeExporter]

What steps will reproduce the problem?
1. If I'm at the end of a line of text and press down Alt + ← I skip a word 
to the left, if I then press ← the cursor moves back to after the word I 
skipped. How do I solve this?

What is the expected output? What do you see instead?
The cursors instead of picking up where I moved it to, it jumps back to where 
it was and then proceeds from there to move left.

What version of the product are you using? On what operating system?
Don't know.

Please provide any additional information below.
I'm one of the moderators for the stackexchange site, Unix & Linux. A user 
posted this Q there and I'm trying to get it resolved for them.

http://unix.stackexchange.com/questions/146178/bash-inside-vim-not-working-prope
rly

There's an active bounty that I put on it for 50pts if you want to A it  
yourself. Your more than welcome to do this.

Original issue reported on code.google.com by [email protected] on 6 Oct 2014 at 7:08