src/vs/base/parts/quickinput/browser/quickInput.ts/InputBox/prompt
class InputBox:	set prompt(prompt: string | undefined) {
		this._prompt = prompt;
		this.noValidationMessage = prompt
			? localize('inputModeEntryDescription', "{0} (Press 'Enter' to confirm or 'Escape' to cancel)", prompt)
			: QuickInput.noPromptMessage;
		this.update();
	}