Change the code example from using `get_history_length` to `get_current_history_length`.
(cherry picked from commit eeb5ffd5)

[3.6] bpo-31728: Prevent crashes in _elementtree due to unsafe cleanup of Element.text and Element.tail (GH-3924) (#3945)

(cherry picked from commit 39ecb9c7)

Fix some tests in ./configure for determining macOS compiler choices that could fail if a $PATH element contained spaces.

(cherry picked from commit f07e2b64)

With the upgrade of buildbot.python.org from Buildbot 0.8.x to 0.9.x,
the xmlrpc interface has been removed.  This test is now skipped until
it can be rewritten to query a suitable substitute.

(cherry picked from commit 73ffd3f2)

(cherry picked from commit 79ba4714)

(cherry picked from commit 28f71360)

(cherry picked from commit 9e7b9b21)

(cherry picked from commit 2084b30e)

(cherry picked from commit a8ed1174)

Fix test_exception_errpipe_bad_data() and
test_exception_errpipe_normal() of test_subprocess: mock os.waitpid()
to avoid calling the real os.waitpid(0, 0) which is an unexpected
side effect of the test.
(cherry picked from commit 11045c9d)

(cherry picked from commit 300dd552)

* Fix incorrect links.
* Remove redundant links.
* Add signatures and index entries for gettext related
functions in the locale module.
(cherry picked from commit c02a1f4a)

when pass a string larger than 2 GiB.

Decrease memory requirements for Tcl's bigmem tests.
(cherry picked from commit 27c623c8)

(cherry picked from commit 929b40a6)

[3.6] bpo-31619: Fixed a ValueError when convert a string with large number of underscores (GH-3827) (#3863)

to integer with binary base.
(cherry picked from commit 85c0b894)

(cherry picked from commit efb560ee)

This was possible before.  GH-1560 introduced a regression after 3.6.2 got
released where only sequences were accepted now.  This commit addresses this
problem.
(cherry picked from commit 574562c5)

Use prefixed macro names for the `authoraddress` function, add T2A to the font encoding in LaTeX sources to support Cyrillic characters in the PDF documentation, and replace the deprecated `font_size` config option with `pointsize`.
(cherry picked from commit da9b4cfb)

(cherry picked from commit efb560ee)

bpo-31516: current_thread() should not return a dummy thread at shutdown
(cherry picked from commit 1023dbbc)

(cherry picked from commit e6f62f69)

Save a bit of code, plus non-tuples get converted anyway to tuples by tkinter for the tk call.
(cherry picked from commit 5961e7c1)

Passing a widget instead of an flist with a root widget opens the option of
creating a browser frame that is only part of a window. Passing a full file
name instead of pieces assumed to come from a .py file opens the possibility
of browsing python files that do not end in .py.
(cherry picked from commit d6bb65f3)

(cherry picked from commit bfebfd81)

(cherry picked from commit f4ea642c)

[3.6] bpo-31592: Fix an assertion failure in Python parser in case of a bad unicodedata.normalize(). (GH-3767) (#3836)

(cherry picked from commit 7dc46d8c)

This was possible before.  GH-1560 introduced a regression after 3.6.2 got
released where only sequences were accepted now.  This commit addresses this
problem.
(cherry picked from commit 574562c5)

(forgot to remove it in GH-3219)
(cherry picked from commit 8b4ff53c)

(cherry picked from commit 90f1d989)

Replace "restriction" with "restrictions".
(cherry picked from commit 8d59aca4)

* init commit, with initial tests for from_param and fields __set__ and __get__, and some additions to from_buffer and from_buffer_copy

* added the rest of tests and patches. probably only a first draft.

* removed trailing spaces

* replace ctype with ctypes in error messages

* change back from ctypes instance to ctype instance

(cherry picked from commit 1bea762d)