History navigation in chat input box should only happen on up arrow if on first char of line #273168
Description
Currently, our chat input box navigates history if a user is anywhere on the first line and presses up arrow. This is confusing for screen readers. We should follow the behavior of the SCM view and only navigate up if the cursor is in the first position.
So, on the second line in chat input:
- arrow up -> cursor moves up a line
- arrow up -> cursor moves to first index of first line
- arrow up -> history