Annotations: Fix performance of BlockListBlock

Because we passed an array of classes returned from `.filter` this would always return a new array. Making `BlockListBlock` rerender.
WordPress · Dec 9, 2018 · 29694f1 · 29694f1
1 parent 3ceb332
commit 29694f1
Showing 1 changed file with 7 additions and 2 deletions.
diff --git a/packages/annotations/src/block/index.js b/packages/annotations/src/block/index.js
@@ -1,3 +1,8 @@
+/**
+ * External dependencies
+ */
+import { uniq } from 'lodash';
+
 /**
  * WordPress dependencies
  */
@@ -15,9 +20,9 @@ const addAnnotationClassName = ( OriginalComponent ) => {
 		const annotations = select( 'core/annotations' ).__experimentalGetAnnotationsForBlock( clientId );
 
 		return {
-			className: annotations.map( ( annotation ) => {
+			className: uniq( annotations.map( ( annotation ) => {
 				return 'is-annotated-by-' + annotation.source;
-			} ),
+			} ) ).join( ' ' ),
 		};
 	} )( OriginalComponent );
 };