Document a workaround for a curses bug

The ncurses library has a bug which can provoke a segfault when a window
is resized.  The bug is provoked when a string with embedded newlines is
added via addstr().  This commit documents that problem in the curses
python library documentation and relates how to workaround the problem
in the calling code.

Related to https://bugs.python.org/issue35924

Doc/library/curses.rst

@@ -708,9 +708,16 @@ the following methods and attributes:
 
    .. note::
 
-      Writing outside the window, subwindow, or pad raises :exc:`curses.error`.
-      Attempting to write to the lower right corner of a window, subwindow,
-      or pad will cause an exception to be raised after the string is printed.
+      * Writing outside the window, subwindow, or pad raises :exc:`curses.error`.
+        Attempting to write to the lower right corner of a window, subwindow,
+        or pad will cause an exception to be raised after the string is printed.
+
+      * A `bug in ncurses <https://bugs.python.org/issue35924>`_, the backend
+        for this Python module, can cause SegFaults when resizing windows. This
+        is fixed in ncurses-6.1-20190511.  If you are stuck with an earlier
+        ncurses, you can avoid triggering this if you do not call :func:`addstr`
+        with a *str* that has embedded newlines.  Instead, call :func:`addstr`
+        separately for each line.
 
 
 .. method:: window.attroff(attr)

Misc/NEWS.d/next/Documentation/2019-05-08-13-17-44.bpo-35924.lqbNpW.rst

@@ -0,0 +1,2 @@
+Add a note to the ``curses.addstr()`` documentation to warn that multiline
+strings can cause segfaults because of an ncurses bug.