FIX Don't try to save blocks in a readonly elemental area (#1292)

client/src/legacy/ElementEditor/entwine.js

@@ -101,7 +101,7 @@ jQuery.entwine('ss', ($) => {
 
     'from .cms-edit-form': {
       onbeforesubmitform(event, data) {
-        if (!data) {
+        if (!data || this.is('.elemental-area--read-only')) {
           return;
         }
         // Create a promise and expose the resolve function

tests/Behat/features/restore-archived-page.feature

@@ -0,0 +1,34 @@
+@javascript @retry @job6
+Feature: Restore to draft
+  As a CMS author
+  I want to restore archived pages with elemental areas to draft version
+
+  Background:
+    Given I add an extension "DNADesign\Elemental\Extensions\ElementalPageExtension" to the "Page" class
+      And a "page" "MyPage"
+      And the "group" "EDITOR" has permissions "Access to 'Pages' section" and "Access to 'Archive' section"
+      And I am logged in as a member of "EDITOR" group
+      And I go to "/admin/pages"
+      And I should see "MyPage"
+      And I click on "MyPage" in the tree
+      And I press the "Publish" button
+
+  Scenario: I can restore archived elemental block to draft version
+    When I press the "Add block" button
+    Then I click on the ".font-icon-block-content" element
+    Then I should see "Untitled Content block" in the ".element-editor__element" element
+    And I click on the ".element-editor__element" element
+    And I fill in "Form_ElementForm_1_Title" with "MyBlock"
+    When I press the "View actions" button
+    And I press the "Publish" button
+    And I wait 1 second
+    And I click "More options" in the "#ActionMenus" element
+    And I press the "Unpublish and archive" button, confirming the dialog
+    And I go to "/admin/archive"
+    Then I should see "MyPage" in the "#Form_EditForm" element
+    Then I click "MyPage" in the "#Form_EditForm" element
+    When I press the "Restore to draft" button
+    Then I should see "Successfully restored the page" in the "#Form_EditForm" element
+    And I go to "/admin/pages"
+    And I click on "MyPage" in the tree
+    Then I should see "MyBlock" in the ".element-editor__element" element