src/vs/base/browser/keyboardEvent.ts/StandardKeyboardEvent/_computeRuntimeKeybinding
class StandardKeyboardEvent:	private _computeRuntimeKeybinding(): SimpleKeybinding {
		let key = KeyCode.Unknown;
		if (this.keyCode !== KeyCode.Ctrl && this.keyCode !== KeyCode.Shift && this.keyCode !== KeyCode.Alt && this.keyCode !== KeyCode.Meta) {
			key = this.keyCode;
		}
		return new SimpleKeybinding(this.ctrlKey, this.shiftKey, this.altKey, this.metaKey, key);
	}