Disable Save button when entry has not been changed.

src/components/EntryEditor/EntryEditor.js

@@ -47,6 +47,7 @@ class EntryEditor extends Component {
         fieldsErrors,
         getAsset,
         onChange,
+        hasChanged,
         showDelete,
         onDelete,
         onValidate,
@@ -131,6 +132,7 @@ class EntryEditor extends Component {
             onCancelEdit={onCancelEdit}
             onDelete={onDelete}
             showDelete={showDelete}
+            hasChanged={hasChanged}
           />
         </div>
       </div>
@@ -149,6 +151,7 @@ EntryEditor.propTypes = {
   onChange: PropTypes.func.isRequired,
   onValidate: PropTypes.func.isRequired,
   onPersist: PropTypes.func.isRequired,
+  hasChanged: PropTypes.bool.isRequired,
   showDelete: PropTypes.bool.isRequired,
   onDelete: PropTypes.func.isRequired,
   onRemoveAsset: PropTypes.func.isRequired,

src/components/EntryEditor/EntryEditorToolbar.js

@@ -5,11 +5,12 @@ const EntryEditorToolbar = (
   {
     isPersisting,
     onPersist,
+    hasChanged,
     showDelete,
     onDelete,
     onCancelEdit,
   }) => {
-  const disabled = isPersisting;
+  const disabled = !hasChanged || isPersisting;
   return (
     <div>
       <Button
@@ -37,6 +38,7 @@ const EntryEditorToolbar = (
 EntryEditorToolbar.propTypes = {
   isPersisting: PropTypes.bool,
   onPersist: PropTypes.func.isRequired,
+  hasChanged: PropTypes.bool.isRequired,
   showDelete: PropTypes.bool.isRequired,
   onDelete: PropTypes.func.isRequired,
   onCancelEdit: PropTypes.func.isRequired,