Factor common Editor{Group,Link} code out into EditorSublistBase

EditorGroup.js

@@ -1,15 +1,10 @@
-class EditorGroup extends EditorEntryBase {
+class EditorGroup extends EditorSublistBase {
   constructor(id, entries) {
-    super(id);
-
-    this.elem_.innerText = '□';
-    this.elem_.classList.add('group');
-
-    let nodeList = document.createElement('div');
-    this.nodes_ = new Editor(nodeList, [
+    super(id, '□', 'group', [
       [EditorNode,  [1, Number.POSITIVE_INFINITY]],
       [EditorLabel, [0, 1]],
     ]);
+
     if (entries && entries.length) {
       for (let entry of entries) {
         this.nodes_.addNodeAfter(entry.getLabel());
@@ -17,22 +12,11 @@ class EditorGroup extends EditorEntryBase {
     } else {
       this.nodes_.addNodeAfter();
     }
-    this.elem_.appendChild(nodeList);
-  }
-
-  afterDomAdd() {
-    this.nodes_.selectNext();
-    let node = this.nodes_.getSelected().xArchObj;
-    if (node.getLabel() == '') {
-      node.startEdit();
-    }
   }
 
   serialize() {
     return super.serialize({
       type: 'group',
-      label: this.getLabel(),
-      labelObj: this.getLabelObj() ? this.getLabelObj().serialize() : null,
       members: this.nodes_.serialize(EditorNode),
     });
   }
@@ -41,39 +25,6 @@ class EditorGroup extends EditorEntryBase {
     return this.nodes_.getEntries(EditorNode);
   }
 
-  getLabel() {
-    let label = this.getLabelObj();
-    return label ? label.getLabel() : null;
-  }
-
-  setLabel(label, labelId) {
-    let obj = this.nodes_.getEntries(EditorLabel)[0];
-    if (obj) {
-      obj.setLabel(label);
-    } else {
-      this.nodes_.addLabelBefore(labelId);
-      this.setLabel(label);
-    }
-  }
-
-  getLabelObj() {
-    return this.nodes_.getEntries(EditorLabel)[0];
-  }
-
-  onKeyDown(e) {
-    super.onKeyDown(e);
-
-    switch (e.key) {
-      case 'Enter':
-      case 'ArrowRight':
-      case 'l':
-        this.nodes_.selectNext();
-        e.stopPropagation();
-        e.preventDefault();
-        break;
-    }
-  }
-
   static unserialize(ser) {
     //// Backwards compat
     // 3bdb240