The new oldtest directory is in test/old/testdir. The reason for this is
that many tests have hardcoded the parent directory name to be
'testdir'.

Problem:    ml_get error with specific win_execute() command. (Sean Dewar)
Solution:   Check cursor and Visual area are OK.
https://github.com/vim/vim/commit/e664a327014f4aa8baf8549a34a4caab2f3116a3

Problem:    ml_get error when win_execute redraws with Visual selection.
Solution:   Disable Visual area temporarily. (closes vim/vim#9479)
https://github.com/vim/vim/commit/18f4740f043b353abe47b7a00131317052457686

{switch_to/restore}_win_for_buf is N/A (marked as such in v8.0.0860; currently
only used in Vim's if_py).

Add a modeline to test_execute_func.vim.

Problem:    More functions can be used as methods.
Solution:   Make various functions usable as a method.
https://github.com/vim/vim/commit/f92e58cadb03156879e9bdbf6341bf662d9c87cc

Cherry-pick s:normalize_fname for tolower test from v8.1.0894 and v8.1.1417 (even though it is
unused for now).

Fix header for win_id2tabwin in eval.txt.

Problem:    Directory is wrong after executing "lcd" with win_execute().
Solution:   Correct the directory when going back to the original window.
            (closes vim/vim#9132)
https://github.com/vim/vim/commit/7f13b24ab6aca808262e68680d8fe5f082670ebd

Problem:    win_execute() unexpectedly returns number zero when failing.
Solution:   Return an empty string. (closes vim/vim#7665)
https://github.com/vim/vim/commit/37487e16da7877129edee8d11b9b7f5c8df312c6

Problem:    Ruler is not updated if win_execute() moves cursor.
Solution:   Update the status line. (closes vim/vim#5022)
https://github.com/vim/vim/commit/345f28df5482cd35f5fa74b06443376379f113b0

Problem:    Win_execute() does not work in other tab. (Rick Howe)
Solution:   Take care of the tab. (closes vim/vim#4792)
https://github.com/vim/vim/commit/820680b9ff1de8699156c7b060f97e5c0b87ad15

Problem:    Win_execute() test fails.
Solution:   Adjust the expected error number.  Move to popup test.
https://github.com/vim/vim/commit/2d247849ce612050ba1085df806746b23be1f0a3

Problem:    Win_execute() is not implemented yet.
Solution:   Implement it.
https://github.com/vim/vim/commit/868b7b6712ea4f2232eeeae18c5cbbbddf2ee84d