Un-wait a waiting task when done

Implements #2322

test/wait.t

@@ -100,6 +100,22 @@ class Test1486(TestCase):
         self.assertNotIn('regular', out)
 
 
+class TestFeature2322(TestCase):
+    def setUp(self):
+        """Executed before each test in the class"""
+        self.t = Task()
+
+    def test_done_unwait(self):
+        """2322: Done should un-wait a waiting task"""
+        self.t("add foo wait:tomorrow")
+        code, out, err = self.t("export")
+        self.assertIn('"wait":', out)
+
+        self.t("1 done")
+        code, out, err = self.t("export")
+        self.assertNotIn('"wait":', out)
+
+
 if __name__ == "__main__":
     from simpletap import TAPTestRunner
     unittest.main(testRunner=TAPTestRunner())