Rename method.

I think extractOriginalChanged() makes more sense than OriginalDirty
did. I considered calling the method extractUntouched() at Lorenzo's
suggestion, but the method gets properties that have been touched.

Refs #6467

src/Datasource/EntityTrait.php

@@ -528,7 +528,7 @@ public function extract(array $properties, $onlyDirty = false)
      * Returns an array with the requested original properties
      * stored in this entity, indexed by property name.
      *
-     * Properties that have not changed will be included in the
+     * Properties that have are unchanged changed will be included in the
      * return of this method.
      *
      * @param array $properties List of properties to be returned
@@ -550,13 +550,13 @@ public function extractOriginal(array $properties)
      * Returns an array with only the original properties
      * stored in this entity, indexed by property name.
      *
-     * This method will only return properties that have been modified.
-     * Unchanged properties will be omited.
+     * This method will only return properties that have been modified since
+     * the entity was built unchanged properties will be omitted.
      *
      * @param array $properties List of properties to be returned
      * @return array
      */
-    public function extractOriginalDirty(array $properties)
+    public function extractOriginalChanged(array $properties)
     {
         $result = [];
         foreach ($properties as $property) {

src/ORM/Behavior/CounterCacheBehavior.php

@@ -138,7 +138,7 @@ protected function _processAssociation(Event $event, Entity $entity, Association
         $countConditions = $entity->extract($foreignKeys);
         $updateConditions = array_combine($primaryKeys, $countConditions);
 
-        $countOriginalConditions = $entity->extractOriginalDirty($foreignKeys);
+        $countOriginalConditions = $entity->extractOriginalChanged($foreignKeys);
         if ($countOriginalConditions !== []) {
             $updateOriginalConditions = array_combine($primaryKeys, $countOriginalConditions);
         }

tests/TestCase/ORM/EntityTest.php

@@ -92,7 +92,7 @@ public function testExtractOriginal()
         ];
         $this->assertEquals($expected, $result);
 
-        $result = $entity->extractOriginalDirty(['id', 'title', 'body']);
+        $result = $entity->extractOriginalChanged(['id', 'title', 'body']);
         $expected = [
             'body' => 'no',
         ];