X.Prompt: handle Return key in vim normal mode

[l29ah]

Description

Avoiding RAGE when one can't just use Return key in the normal mode like in vim.

Checklist

• [ ] I've read CONTRIBUTING.md

• [ ] I've considered how to best test these changes (property, unit, manually, ...) and concluded: XXX

• [ ] I updated the CHANGES.md file

[slotThe]

Thanks!