PSReadline should not bind to keys that are not usable #3890
Description
On Nano, two apis are not available which prevents usage, for example, of ctrl+] as a valid key chord to bind to a PSReadline handler. PSReadline, by default, binds this key combination to go to matching brace. When connected directly to a Nano container (not via PSRP), it will show:
Ctrl+Oem6 GotoBrace Go to matching brace
which is not useful to the end user. It seems the right thing to do may be to not bind this (as well as two other chords dependent on ]) by default if those APIs are not avaialble.