Fix forEachDescendant early exit

src/models/node.js

@@ -178,12 +178,19 @@ const Node = {
    */
 
   forEachDescendant(iterator) {
-    return this.nodes.forEach((child, i, nodes) => {
+    let returned // Returned value of iterator. False to break from loop
+
+    this.nodes.forEach((child, i, nodes) => {
       if (iterator(child, i, nodes) === false) {
-        return false
+        return returned = false
+      }
+
+      if (child.kind != 'text') {
+        return returned = child.forEachDescendant(iterator)
       }
-      if (child.kind != 'text') child.forEachDescendant(iterator)
     })
+
+    return returned
   },
 
   /**

src/models/selection.js

@@ -332,10 +332,10 @@ class Selection extends new Record(DEFAULTS) {
 
     // If `isBackward` is not set, derive it.
     if (isBackward == null) {
-      if (anchorKey === focusKey) {
+      if (anchorNode.key === focusNode.key) {
         isBackward = anchorOffset > focusOffset
       } else {
-        isBackward = !node.areDescendantSorted(anchorKey, focusKey)
+        isBackward = !node.areDescendantSorted(anchorNode.key, focusNode.key)
       }
     }