Fixed global functions from QT_TR_NOOP and QT_TRANSLATE_NOOP family.

These function just return one of their arguments as result, and the
buggy implementation was forgetting to increment the reference count for
the returned object.

A new unit test was added.

Reviewed by Hugo Parente <hugo.lima@openbossa.org>
Reviewed by Renato Araújo <renato.filho@openbossa.org>

tests/QtCore/tr_noop_test.py

@@ -0,0 +1,48 @@
+import unittest
+
+import sys
+from PySide.QtCore import QT_TR_NOOP, QT_TR_NOOP_UTF8
+from PySide.QtCore import QT_TRANSLATE_NOOP, QT_TRANSLATE_NOOP3, QT_TRANSLATE_NOOP_UTF8
+
+class QtTrNoopTest(unittest.TestCase):
+
+    def setUp(self):
+        self.txt = 'Cthulhu fhtag!'
+
+    def tearDown(self):
+        del self.txt
+
+    def testQtTrNoop(self):
+        refcnt = sys.getrefcount(self.txt)
+        result = QT_TR_NOOP(self.txt)
+        self.assertEqual(result, self.txt)
+        self.assertEqual(sys.getrefcount(result), refcnt + 1)
+
+    def testQtTrNoopUtf8(self):
+        refcnt = sys.getrefcount(self.txt)
+        result = QT_TR_NOOP_UTF8(self.txt)
+        self.assertEqual(result, self.txt)
+        self.assertEqual(sys.getrefcount(result), refcnt + 1)
+
+    def testQtTranslateNoop(self):
+        refcnt = sys.getrefcount(self.txt)
+        result = QT_TRANSLATE_NOOP(None, self.txt)
+        self.assertEqual(result, self.txt)
+        self.assertEqual(sys.getrefcount(result), refcnt + 1)
+
+    def testQtTranslateNoopUtf8(self):
+        refcnt = sys.getrefcount(self.txt)
+        result = QT_TRANSLATE_NOOP_UTF8(self.txt)
+        self.assertEqual(result, self.txt)
+        self.assertEqual(sys.getrefcount(result), refcnt + 1)
+
+    def testQtTranslateNoop3(self):
+        refcnt = sys.getrefcount(self.txt)
+        result = QT_TRANSLATE_NOOP3(None, self.txt, None)
+        self.assertEqual(result, self.txt)
+        self.assertEqual(sys.getrefcount(result), refcnt + 1)
+
+
+if __name__ == '__main__':
+    unittest.main()
+