Sidebar: Expand advanced panel if only item in settings tab

packages/block-editor/src/components/inspector-controls-tabs/advanced-controls-panel.js

@@ -14,11 +14,18 @@ import {
 	default as InspectorControls,
 	InspectorAdvancedControls,
 } from '../inspector-controls';
+import InspectorControlsGroups from '../inspector-controls/groups';
 
 const AdvancedControls = () => {
 	const fills = useSlotFills( InspectorAdvancedControls.slotName );
 	const hasFills = Boolean( fills && fills.length );
 
+	// Check fills in settings tab to determine initial open state for panel.
+	const tabsEnabled = window?.__experimentalEnableBlockInspectorTabs;
+	const { default: defaultGroup } = InspectorControlsGroups;
+	const settingFills = useSlotFills( defaultGroup.Slot.__unstableName ) || [];
+	const open = !! tabsEnabled && ! settingFills.length;
+
 	if ( ! hasFills ) {
 		return null;
 	}
@@ -27,7 +34,7 @@ const AdvancedControls = () => {
 		<PanelBody
 			className="block-editor-block-inspector__advanced"
 			title={ __( 'Advanced' ) }
-			initialOpen={ false }
+			initialOpen={ open }
 		>
 			<InspectorControls.Slot __experimentalGroup="advanced" />
 		</PanelBody>