From 7c4c2caf742853fa2578a9d10e9d9cb603ea3e6d Mon Sep 17 00:00:00 2001
From: Andrew Duthie <andrew@andrewduthie.com>
Date: Mon, 30 Oct 2017 12:29:05 -0400
Subject: [PATCH] Performance: Memoize by specific block selection state keys

---
 editor/selectors.js | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/editor/selectors.js b/editor/selectors.js
index 0eff48fabd54ef..2eeb44968ab677 100644
--- a/editor/selectors.js
+++ b/editor/selectors.js
@@ -569,7 +569,11 @@ export const getMultiSelectedBlockUids = createSelector(
 
 		return blockOrder.slice( startIndex, endIndex + 1 );
 	},
-	( state ) => [ state.editor.blockOrder, state.blockSelection ],
+	( state ) => [
+		state.editor.blockOrder,
+		state.blockSelection.start,
+		state.blockSelection.end,
+	],
 );
 
 /**
@@ -583,7 +587,8 @@ export const getMultiSelectedBlocks = createSelector(
 	( state ) => getMultiSelectedBlockUids( state ).map( ( uid ) => getBlock( state, uid ) ),
 	( state ) => [
 		state.editor.blockOrder,
-		state.blockSelection,
+		state.blockSelection.start,
+		state.blockSelection.end,
 		state.editor.blocksByUid,
 		state.editor.edits.meta,
 		state.currentPost.meta,