src/vs/workbench/contrib/terminal/browser/terminalInstance.ts/TerminalInstance/_getIcon
class TerminalInstance:	private _getIcon(): TerminalIcon | undefined {
		const icon = this._shellLaunchConfig.icon || this._shellLaunchConfig.attachPersistentProcess?.icon;
		if (!icon) {
			return this._processManager.processState >= ProcessState.Launching ? Codicon.terminal : undefined;
		}
		return icon;
	}