src/vs/workbench/contrib/extensions/browser/extensionsActions.ts/SetProductIconThemeAction/update
class SetProductIconThemeAction:	update(): void {
		this.enabled = !!this.extension && (this.extension.state === ExtensionState.Installed) && this.productIconThemes.some(th => isThemeFromExtension(th, this.extension));
		this.class = this.enabled ? SetProductIconThemeAction.EnabledClass : SetProductIconThemeAction.DisabledClass;
	}