src/vs/workbench/services/keybinding/browser/keybindingService.ts/WorkbenchKeybindingService/_printUserBinding
class WorkbenchKeybindingService:	private _printUserBinding(parts: (SimpleKeybinding | ScanCodeBinding)[]): string {
		return UserSettingsLabelProvider.toLabel(OS, parts, (part) => {
			if (part instanceof SimpleKeybinding) {
				return KeyCodeUtils.toString(part.keyCode);
			}
			return ScanCodeUtils.toString(part.scanCode);
		}) || '[null]';
	}