Problem:    Command line completion popup menu positioned wrong when using a
            terminal window.
Solution:   Position the popup menu differently when editing the command line.
            (Yegappan Lakshmanan, closes vim/vim#10050, closes vim/vim#10035)

https://github.com/vim/vim/commit/1104a6d0c2004d39e9b6cb8f804d12b628a69869

The test in the patch looks a bit hard to understand.
Add a Lua test that is more straightforward.

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

Problem:    Cannot lock a variable in legacy Vim script like in Vim9.
Solution:   Make ":lockvar 0" work.

https://github.com/vim/vim/commit/a187c43cfe8863d48b2159d695fedcb71f8525c1

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

Problem:    Test for fuzzy completion fails sometimes.
Solution:   Use a more specific file name to minimize the chance of matching a
            random directory name. (closes vim/vim#10854)

https://github.com/vim/vim/commit/5ac4b1a24e3ba52698a0d24b22cdd2e1c7895417

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

Problem:    Adding a line below the last one does not expand fold.
Solution:   Do not skip mark_adjust() when adding lines below the last one.
            (Brandon Simmons, closes vim/vim#11832, closes vim/vim#10698)

https://github.com/vim/vim/commit/da3dd7d857ba4fb4bf408dedd1d9d6a2d5e2ae9f

Co-authored-by: Brandon Simmons <simmsbra@gmail.com>

Problem:    File left behind after running tests.
Solution:   Delete the file. (Dominique Pellé, closes vim/vim#11839)

https://github.com/vim/vim/commit/541c87c808df91b55e51fedc4987152a3edfe80d

Co-authored-by: Dominique Pelle <dominique.pelle@gmail.com>

Problem:    Cannot read back what setcellwidths() has done.
Solution:   Add getcellwidths(). (Kota Kato, closes vim/vim#11837)

https://github.com/vim/vim/commit/66bb9ae70f7371456ed76518076d2a344f8ab417

Co-authored-by: Kota Kato <github@kat0h.com>

Problem:    Substitute may overrun destination buffer.
Solution:   Disallow switching buffers in a substitute expression.

https://github.com/vim/vim/commit/d6211a52ab9f53b82f884561ed43d2fe4d24ff7d

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

Problem:    No completion for :scriptnames.
Solution:   Implement :scriptnames completion. (Yegappan Lakshmanan,
            closes vim/vim#10005)

https://github.com/vim/vim/commit/454ce6737cadb82886f1fc0eb9e8666cc59ae42b

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

Problem:    Command completion makes two rounds to collect matches.
Solution:   Use a growarray to collect matches. (Yegappan Lakshmanan,
            closes vim/vim#9860)

https://github.com/vim/vim/commit/5de4c4372d4366bc85cb66efb3e373439b9471c5

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

Problem:    Using NULL regexp program.
Solution:   Check for regexp program becoming NULL in more places.

https://github.com/vim/vim/commit/b62dc5e7825bc195efe3041d5b3a9f1528359e1c

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