code_mirror: also support yapf for ZMI Python Scripts

bt5/erp5_code_mirror/SkinTemplateItem/portal_skins/erp5_code_mirror/code_mirror_support.txt

@@ -346,7 +346,28 @@
  }
 
  function saveZMIDocument(cm, event) {
-   $('input[value="Save Changes"]').click();
+   /* preformat with YAPF before saving */
+   if (mode == 'python') {
+     $.ajax({
+       type: 'POST',
+       url: '&dtml-portal_url;/ERP5Site_formatPythonSourceCode',
+       data: {code: cm.getValue()},
+       success: function refreshTextContent(textContent) {
+         if (textContent !== cm.getValue()) {
+           if (cm.hasFocus()) {
+             const cursorPosition = cm.getCursor();
+             cm.setValue(textContent);
+             cm.setCursor(cursorPosition);
+           } else {
+             cm.setValue(textContent);
+           }
+         }
+         $('input[value="Save Changes"]').click();
+       }
+     });
+   } else {
+     $('input[value="Save Changes"]').click();
+   }
    return false;
  }