src/vs/workbench/services/keybinding/common/keymapInfo.ts/KeymapInfo/constructor
class KeymapInfo:	constructor(public layout: IKeyboardLayoutInfo, public secondaryLayouts: IKeyboardLayoutInfo[], keyboardMapping: ISerializedMapping, isUserKeyboardLayout?: boolean) {
		this.mapping = deserializeMapping(keyboardMapping);
		this.isUserKeyboardLayout = !!isUserKeyboardLayout;
		this.layout.isUserKeyboardLayout = !!isUserKeyboardLayout;
	}