Fixes wrapped widgets not being created on editor instanciation.

src/editor/widgets/WrappedWidget.jsx

@@ -1,32 +1,38 @@
 import React, { Component } from 'react';
 
 export default class WrappedWidget extends Component {
-
   constructor(props) {
     super(props);
 
     this.element = React.createRef();
   }
 
+  updateWidget(props) {
+    const widgetEl = this.props.widget({
+      annotation: props.annotation,
+      readOnly: props.readOnly,
+      ...this.props.config,
+      onAppendBody: body => props.onAppendBody(body),
+      onUpdateBody: (previous, updated) => props.onUpdateBody(previous, updated),
+      onRemoveBody: body => props.onRemoveBody(body),
+      onSaveAndClose: () => props.onSaveAndClose()
+    });
+
+    // Delete previous rendered state
+    while (this.element.current.firstChild)
+      this.element.current.removeChild(this.element.current.lastChild);
+
+    this.element.current.appendChild(widgetEl);
+  }
+
+  componentDidMount() {
+    this.updateWidget(this.props);
+  }
+
   componentWillReceiveProps(next) {
     if (this.element.current) {
       if (this.props.annotation !== next.annotation) {
-        
-        const widgetEl = this.props.widget({
-          annotation: next.annotation,
-          readOnly: next.readOnly,
-          ...this.props.config,
-          onAppendBody: body => next.onAppendBody(body),
-          onUpdateBody: (previous, updated) => next.onUpdateBody(previous, updated),
-          onRemoveBody: body => next.onRemoveBody(body),
-          onSaveAndClose: () => next.onSaveAndClose()
-        });
-
-        // Delete previous rendered state
-        while (this.element.current.firstChild)
-          this.element.current.removeChild(this.element.current.lastChild);
-  
-        this.element.current.appendChild(widgetEl);  
+        this.updateWidget(next);
       }
     }
   }