[3.6] bpo-25720: Fix the method for checking pad state of curses WINDOW (GH-4164) #4212
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Modify the code to use ncurses is_pad() instead of checking WINDOW
_flags field. If your platform does not provide the is_pad(), the
existing way that checks the field will be enabled.
Note: This change does not drop support for platforms where do not
have both WINDOW _flags field and is_pad().
(cherry picked from commit 8bc7d63)
https://bugs.python.org/issue25720