src/vs/workbench/contrib/codeEditor/browser/suggestEnabledInput/suggestEnabledInput.ts/SuggestEnabledInputWithHistory/showPreviousValue
class SuggestEnabledInputWithHistory:	public showPreviousValue(): void {
		if (!this.history.has(this.getValue())) {
			this.addToHistory();
		}

		let previous = this.getPreviousValue();
		if (previous) {
			previous = previous === this.getValue() ? this.getPreviousValue() : previous;
		}

		if (previous) {
			this.setValue(previous);
			this.inputWidget.setPosition({ lineNumber: 0, column: 0 });
		}
	}