src/vs/workbench/contrib/terminal/browser/terminalInstance.ts/TerminalInstance/_getIcon
class TerminalInstance:	private _getIcon(): TerminalIcon | undefined {
		if (!this._icon) {
			this._icon = this._processManager.processState >= ProcessState.Launching
				? getIconRegistry().getIcon(this._configurationService.getValue(TerminalSettingId.TabsDefaultIcon))
				: undefined;
		}
		return this._icon;
	}