fix <Node> shouldComponentUpdate for blurring

lib/components/node.js

@@ -95,10 +95,26 @@ class Node extends React.Component {
       return true
     }
 
-    // Otherwise, perform a peformant update check by default.
+    // If the node has changed, update.
+    if (props.node != this.props.node) {
+      return true
+    }
+
+    // If the selection is focused and is inside the node, we need to update so
+    // that the selection will be set by one of the <Leaf> components.
     if (
-      props.node != this.props.node ||
+      props.state.isFocused &&
-      (props.state.isFocused && props.state.selection.hasEdgeIn(props.node))
+      props.state.selection.hasEdgeIn(props.node)
+    ) {
+      return true
+    }
+
+    // If the selection is blurred but was previously focused inside the node,
+    // we need to update to ensure the selection gets updated by re-rendering.
+    if (
+      props.state.isBlurred &&
+      this.props.state.isFocused &&
+      this.props.state.selection.hasEdgeIn(props.node)
     ) {
       return true
     }