restore API for DirtyDict

CHANGELOG.md

 # v2.7.1
 
-* _TBA_
+* API change reverted to before 2.7.0
 
 # v2.7.0
 

satella/coding/structures/dictionaries.py

@@ -324,3 +324,13 @@ class DirtyDict(collections.UserDict, tp.Generic[K, V]):
         self.data = {}
         self.dirty = False
         return a
+
+    def copy_and_clear_dirty(self) -> tp.Dict[K, V]:
+        """
+        Returns a copy of this data and sets dirty to False
+
+        :return: a plain, normal Python dictionary is returned
+        """
+        a = self.data.copy()
+        self.dirty = False
+        return a

tests/test_coding/test_structures.py

@@ -26,7 +26,10 @@ class TestMisc(unittest.TestCase):
         self.assertFalse(a.dirty)
         del a[1]
         self.assertTrue(a.dirty)
-        self.assertEqual(a.swap_and_clear_dirty(), {3: 4})
+        self.assertEqual(a.copy_and_clear_dirty(), {3: 4})
+        a[3] = 5
+        self.assertTrue(a.dirty)
+        self.assertEqual(a.swap_and_clear_dirty(), {3: 5})
         self.assertFalse(a)
         self.assertFalse(a.dirty)