src/vs/base/common/keyCodes.ts/ChordKeybinding/getHashCode
class ChordKeybinding:	public getHashCode(): string {
		let result = '';
		for (let i = 0, len = this.parts.length; i < len; i++) {
			if (i !== 0) {
				result += ';';
			}
			result += this.parts[i].getHashCode();
		}
		return result;
	}