Prompt placeholder text should not remain in the terminal when we have entered no text.

[deathbychocolate]

Currently, when you use prompt like this:

def prompt(self, prompt_text: str) -> str:
    """Prompt user with prompt text."""
    return str(
        prompt(
            message=ANSI(f'{ChatColours.GRN.value}{prompt_text}{ChatColours.RST.value}'),
            placeholder=ANSI(f'{ChatColours.GRY.value}Some prompt text...{ChatColours.RST.value}'),
        )
    )

It will give you output similar to this when holding the enter key:

This is misleading as it gives the impression that all lines are active and accepting input.

I recommend a change to make it so that only the last line (ie the only line accepting input) shows the placeholder text.
For example, it should be similar to this: