Fixes #25709 Memoize filtered entity graph nodes

Signed-off-by: Jordan Slott <jordan.slott@twosigma.com>

.changeset/light-pianos-exercise.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-catalog-graph': patch
+---
+
+Memoize entity graph nodes when applying an `entityFilter` to prevent repeated redraws

plugins/catalog-graph/src/components/EntityRelationsGraph/useEntityRelationGraph.ts

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 import { Entity } from '@backstage/catalog-model';
-import { useEffect } from 'react';
+import { useEffect, useMemo } from 'react';
 import { useEntityStore } from './useEntityStore';
 import { pickBy } from 'lodash';
 
@@ -104,9 +104,13 @@ export function useEntityRelationGraph({
     requestEntities,
   ]);
 
-  const filteredEntities = entityFilter
-    ? pickBy(entities, (value, _key) => entityFilter(value))
-    : entities;
+  const filteredEntities = useMemo(
+    () =>
+      entityFilter
+        ? pickBy(entities, (value, _key) => entityFilter(value))
+        : entities,
+    [entities, entityFilter],
+  );
 
   return {
     entities: filteredEntities,