gh-154788: Make curses window.getparent() unconditional (GH-154789)

getparent() calls no curses function, it returns the window's stored parent,
but it was compiled only when the ncurses extension functions were present.
Close the guard after getscrreg(), which does need it.

The test moves out of test_state_getters, which is gated on is_scrollok(), so
that getparent() is covered on backends without the extensions.

Author: fedonman

Lib/test/test_curses.py

@@ -278,6 +278,14 @@ def test_subwindows_references(self):
         del win2
         gc_collect()
 
+    def test_getparent(self):
+        # getparent() calls no curses function, so it works with any backend
+        # and is not gated like the is_*() getters below.
+        stdscr = self.stdscr
+        self.assertIsNone(stdscr.getparent())
+        sub = stdscr.subwin(3, 3, 0, 0)
+        self.assertIs(sub.getparent(), stdscr)
+
     def test_dupwin(self):
         win = curses.newwin(5, 10, 2, 3)
         win.addstr(0, 0, 'ABCDE')
@@ -1771,13 +1779,11 @@ def test_state_getters(self):
         stdscr.setscrreg(5, 10)
         self.assertEqual(stdscr.getscrreg(), (5, 10))
 
-        # is_pad()/is_subwin()/getparent().
+        # is_pad()/is_subwin().
         self.assertIs(stdscr.is_pad(), False)
         self.assertIs(stdscr.is_subwin(), False)
-        self.assertIsNone(stdscr.getparent())
         sub = stdscr.subwin(3, 3, 0, 0)
         self.assertIs(sub.is_subwin(), True)
-        self.assertIs(sub.getparent(), stdscr)
         pad = curses.newpad(5, 5)
         self.assertIs(pad.is_pad(), True)
 

Modules/_cursesmodule.c

@@ -1936,6 +1936,7 @@ PyCursesWindow_getscrreg(PyObject *op, PyObject *Py_UNUSED(ignored))
     }
     return Py_BuildValue("(ii)", top, bottom);
 }
+#endif /* NCURSES_EXT_FUNCS >= 20110404 || PDCURSES */
 
 static PyObject *
 PyCursesWindow_getparent(PyObject *op, PyObject *Py_UNUSED(ignored))
@@ -1948,7 +1949,6 @@ PyCursesWindow_getparent(PyObject *op, PyObject *Py_UNUSED(ignored))
     }
     return Py_NewRef((PyObject *)self->orig);
 }
-#endif /* NCURSES_EXT_FUNCS >= 20110404 || PDCURSES */
 
 Window_NoArgNoReturnVoidFunction(wsyncup)
 Window_NoArgNoReturnVoidFunction(wsyncdown)
@@ -5061,11 +5061,9 @@ static PyMethodDef PyCursesWindow_methods[] = {
     {"getmaxyx", PyCursesWindow_getmaxyx, METH_NOARGS,
      "getmaxyx($self, /)\n--\n\n"
      "Return a tuple (y, x) of the window height and width."},
-#if (defined(NCURSES_EXT_FUNCS) && NCURSES_EXT_FUNCS >= 20110404) || defined(PDCURSES)
     {"getparent", PyCursesWindow_getparent, METH_NOARGS,
      "getparent($self, /)\n--\n\n"
      "Return the parent window, or None if this is not a subwindow."},
-#endif
     {"getparyx", PyCursesWindow_getparyx, METH_NOARGS,
      "getparyx($self, /)\n--\n\n"
      "Return (y, x) relative to the parent window, or (-1, -1) if none."},