Control-D to exit copilot cli should only work on an empty input line #541
Description
Describe the bug
A bunch of times now I have navigated to a place in my prompt to delete a few characters with Control-D and had Copilot CLI immediately exit. I see in the documentation that Control-D is mapped to exit, but that should really only happen on an empty line and not when I am editing a prompt in the middle.
(It is quite maddening that this happens .. becuase the CLI follows "readline compatible" key combinations pretty well, except for control-d, and when you accidentally hit control-d a few times and suddenly not just CLI exits but I also exit my shell and close the window ... )
Affected version
0.0.354 Commit: 076bd172b
Steps to reproduce the behavior
Hit control-d anywhere in a prompt to delete a character.
Expected behavior
When I am editing a prompt, control-d should just delete a character. Not exit copilot.
Additional context
No response