Show in log which fields were changed in a ElementEditedLogEntry.

src/Entity/LogSystem/ElementEditedLogEntry.php

@@ -62,6 +62,24 @@ class ElementEditedLogEntry extends AbstractLogEntry implements TimeTravelInterf
         $this->setTargetElement($changed_element);
     }
 
+    /**
+     * Checks if this log contains infos about which fields has changed.
+     * @return bool
+     */
+    public function hasChangedFieldsInfo(): bool
+    {
+        return $this->hasOldDataInformations();
+    }
+
+    /**
+     * Return the names of all fields that were changed during the change.
+     * @return string[]
+     */
+    public function getChangedFields(): array
+    {
+        return array_keys($this->getOldData());
+    }
+
     /**
      * Sets the old data for this entry.
      * @param array $old_data

src/Services/LogSystem/LogEntryExtraFormatter.php

@@ -144,10 +144,22 @@ class LogEntryExtraFormatter
         }
 
         if ($context instanceof ElementEditedLogEntry) {
+            $str = '';
             if ($context->hasComment()) {
-                return htmlspecialchars($context->getComment());
+                $str .= htmlspecialchars($context->getComment());
             }
 
+            if ($context->hasChangedFieldsInfo()) {
+                if (!empty($str)) {
+                    $str .= '; ';
+                }
+                $str .= sprintf(
+                    "<i>%s:</i> %s",
+                    $this->translator->trans('log.element_edited.changed_fields'),
+                    htmlspecialchars(implode(', ', $context->getChangedFields()))
+                );
+            }
+            return $str;
         }
 
         if ($context instanceof InstockChangedLogEntry) {