Problem:    No command line completion for :breakadd and :breakdel.
Solution:   Add completion for :breakadd and :breakdel. (Yegappan Lakshmanan,
            closes vim/vim#9950)

https://github.com/vim/vim/commit/6e2e2cc95b913e33145047e0fade5193da6e4379

Problem:    MS-Windows: most users expect using Unicode.
Solution:   Default 'encoding' to utf-8 on MS-Windows. (Ken Takata,
            closes vim/vim#3907)

https://github.com/vim/vim/commit/f883d9027c750967b115b82de984ee449ab17aa8

Correct the encoding of the file.

Co-authored-by: K.Takata <kentkt@csc.jp>

Problem:    Not enough tests for writing buffers.
Solution:   Add a few more tests. (Yegappan Lakshmanan, closes vim/vim#8229)

https://github.com/vim/vim/commit/46aa6f93acb5d932d2893606d980a6b4b8a9594c

Co-authored-by: Yegappan Lakshmanan <yegappan@yahoo.com>

Problem:    Get readonly error for device that can't be written to.
Solution:   Check for being able to write first. (closes vim/vim#8205)

https://github.com/vim/vim/commit/50157ef1c2e36d8696e79fd688bdd08312196bc6

Co-authored-by: Bram Moolenaar <Bram@vim.org>

Problem:    Bufwrite not sufficiently tested.
Solution:   Add a few more tests. (Yegappan Lakshmanan, closes vim/vim#8192)

https://github.com/vim/vim/commit/36f96a515109dc1fad279571a645c0f0d65f2de4

Co-authored-by: Yegappan Lakshmanan <yegappan@yahoo.com>

Problem:    Some tests fail when run as root.
Solution:   Use CheckNotRoot.

https://github.com/vim/vim/commit/17709e280ac5ba234b04641cde88d38e3522cedf

Co-authored-by: Bram Moolenaar <Bram@vim.org>

Problem:    Tests fail when run as root.
Solution:   Add a comment mentioning the expected failure. (issue vim/vim#7919)

https://github.com/vim/vim/commit/f9a65505d1d93f3e67e5b8646bde3bbc44c70f7d

Co-authored-by: Bram Moolenaar <Bram@vim.org>

Problem:    Some tests fail on Cirrus CI and/or with FreeBSD.
Solution:   Make 'backupskip' empty. Do not run tests as root. Check for
            directory when using viminfo. (Ozaki Kiichi, closes vim/vim#6596)

https://github.com/vim/vim/commit/b86abadf87bd0f85f800077171ec4b98aefff776

Problem:    assert_fails() checks the last error message.
Solution:   Check the first error, it is more relevant.  Fix all the tests
            that rely on the old behavior.

https://github.com/vim/vim/commit/9b7bf9e98f06ece595fed7a3ff53ecce89797a53

Skip test_listener.vim, test_textprop.vim, test_viminfo.vim.
Skip test_python2.vim: affected line fails and hasn't been ported.
Skip test_python3.vim: affected lines fail and haven't been ported.
Skip CHECK_LIST_MATERIALIZE.

Co-authored-by: Bram Moolenaar <Bram@vim.org>

Problem:    Not sufficient testing for buffer writing.
Solution:   Add a few tests. (Yegappan Lakshmanan, closes vim/vim#6238)

https://github.com/vim/vim/commit/1de5f7c81d5e78fb4d612134bd2dfa6ee9183fae