Problem:    This doesn't give the right result: eval(string(v:true)). (Nikolay
            Pavlov)
Solution:   Make the string "v:true" instead of "true".
https://github.com/vim/vim/commit/f48aa160fdd7b8caa7678e1a2139244dd2bdc547

Problem:    Resetting cmdwin_type only for one situation.
Solution:   Reset cmdwin_type before closing windows. (closes vim/vim#9822)
https://github.com/vim/vim/commit/6a8b13614e5bcb233d20403ae9f008ccba152be3

Move the check to win_free_all to match Vim.

Problem:    Exit test fails on MS-Windows anyway.
Solution:   Skip the test on MS-Windows.
https://github.com/vim/vim/commit/29a9e6971849b4a9eabf14fee1130d51cecfbaa7

Problem:    Beep caused by test.  ASAN reports leaks.
Solution:   Do not put a NL at the end of the script.  Make the text work on
            MS-Windows.  Do not run the test with ASAN.
https://github.com/vim/vim/commit/68eab67119734ea1efc7cef1287276d969f2713a

The test is skipped, but cherry-pick CheckNotAsan from v8.2.2424 anyway.
https://github.com/vim/vim/commit/97202d951685fc4d90085da676a90644cbf72571

Problem:    Test for error reading input fails on MS-Windows.
Solution:   Don't run the test on MS-Windows.
https://github.com/vim/vim/commit/70b9e4f4c3a62e325fd16ac108bd12feb026ede5

Problem:    Crash on exit when using cmdline window.
Solution:   Reset "cmdwin_type" before exiting. (closes vim/vim#9817)
https://github.com/vim/vim/commit/ca0c1caa36823ea8e61184268d7337e79995352f

Bram also went with the cmdwin_type = 0 solution, but putting it in
read_error_exit isn't ideal and only fixes one specific variant of the bug, so
don't port that change.

Port the test only, but skip it as Nvim does not exit after stdin is exhausted.
Using -es instead does exit, but read_error_exit does not run preserve_exit in
that case, and does not have issues exiting even without resetting cmdwin_type.

Note that the test has problems and is fixed in later patches.

Problem:    Can't get the exit value in VimLeave or VimLeavePre autocommands.
Solution:   Add v:exiting like in Neovim. (Yegappan Lakshmanan, closes vim/vim#7395)
https://github.com/vim/vim/commit/f0068c5154a99b86b2c4515a4b93c003b2445cf4

Rearrange VimVarIndex enums and vimvars[] entries to sync with  Vim.

N/A patches for version.c:

vim-patch:8.2.2535: MS-Windows: cannot run all vim9 tests

Problem:    MS-Windows: cannot run all vim9 tests.
Solution:   Make test_vim9 target work.
https://github.com/vim/vim/commit/723ef5db980b2e69ef8bdc0dd448cb645491c464

Problem:    ExitPre autocommand may cause accessing freed memory.
Solution:   Check the window pointer is still valid. (closes vim/vim#5093)
https://github.com/vim/vim/commit/34ba06b6e6f94bb46062e6c85dbfdcbb0d255ada

Problem:    Code and data in tests can be hard to read.
Solution:   Use the new heredoc style. (Yegappan Lakshmanan, closes vim/vim#4400)
https://github.com/vim/vim/commit/c79745a82faeb5a6058e915ca49a4c69fa60ea01

Problem:    No autocommand triggered before exiting.
Solution:   Add the ExitPre autocommand event.
https://github.com/vim/vim/commit/12a96de430779b88795fac87a2be666d9f661d1e