bind 'set revert-all-at-newline on'

References:

• Superuser - How can I reset an edited history line in Bash?
• Superuser - How to prevent Bash from altering history?
• Unix Stackexcange - Is there any way to undo a bash history modification?

References:

• Prevent accidental history editing in bash
• How can I reset an edited history line in Bash?

“It's even more complicated. Bash seems to restore the originally executed command, if you go back to its modified version using up, erase that one completely (C-u), press enter, and then again go back in the history. Don't ask me why. – Uwe May 8, 2013 at 12:02”

References:

• A comment to Superuser - How can I reset an edited history line in Bash?