Update/multi block mover (#5864)

* Update block-mover sources for isFirst/isLast.

* Move logic to multi-controls.

* Calculate isFirst/isLast within connect.

* Linting.

editor/components/block-list/multi-controls.js

@@ -2,6 +2,7 @@
  * External dependencies
  */
 import { connect } from 'react-redux';
+import { first, last } from 'lodash';
 
 /**
  * Internal dependencies
@@ -11,9 +12,11 @@ import BlockSettingsMenu from '../block-settings-menu';
 import {
 	getMultiSelectedBlockUids,
 	isMultiSelecting,
+	getBlockIndex,
+	getBlockCount,
 } from '../../store/selectors';
 
-function BlockListMultiControls( { multiSelectedBlockUids, rootUID, isSelecting } ) {
+function BlockListMultiControls( { multiSelectedBlockUids, rootUID, isSelecting, isFirst, isLast } ) {
 	if ( isSelecting ) {
 		return null;
 	}
@@ -23,6 +26,8 @@ function BlockListMultiControls( { multiSelectedBlockUids, rootUID, isSelecting
 			key="mover"
 			rootUID={ rootUID }
 			uids={ multiSelectedBlockUids }
+			isFirst={ isFirst }
+			isLast={ isLast }
 		/>,
 		<BlockSettingsMenu
 			key="menu"
@@ -33,9 +38,17 @@ function BlockListMultiControls( { multiSelectedBlockUids, rootUID, isSelecting
 	];
 }
 
-export default connect( ( state ) => {
+export default connect( ( state, ownProps ) => {
+	const { rootUID } = ownProps;
+	const uids = getMultiSelectedBlockUids( state );
+
+	const firstIndex = getBlockIndex( state, first( uids ), rootUID );
+	const lastIndex = getBlockIndex( state, last( uids ), rootUID );
+
 	return {
-		multiSelectedBlockUids: getMultiSelectedBlockUids( state ),
+		multiSelectedBlockUids: uids,
 		isSelecting: isMultiSelecting( state ),
+		isFirst: firstIndex === 0,
+		isLast: lastIndex + 1 === getBlockCount( state ),
 	};
 } )( BlockListMultiControls );