src/vs/workbench/contrib/remote/browser/tunnelView.ts/TunnelItem/icon
class TunnelItem:	get icon(): ThemeIcon | undefined {
		switch (this.privacy) {
			case TunnelPrivacy.Public: return publicPortIcon;
			default: {
				if (this.tunnelType !== TunnelType.Add) {
					return privatePortIcon;
				} else {
					return undefined;
				}
			}
		}
	}