Problem:    There is no easy way to translate a string with a key code into a
            readable string.
Solution:   Add the keytrans() function. (closes vim/vim#11114)
https://github.com/vim/vim/commit/cdc839353f68ca43db6446e1b727fc7ba657b738

vim-patch:7b2d87220c6c

Add missing part of patch
https://github.com/vim/vim/commit/7b2d87220c6c974d5cdae672b6f9620a6bcbd1dc

Problem:    There is no way to get the byte index from a virtual column.
Solution:   Add virtcol2col(). (Yegappan Lakshmanan, closes vim/vim#10477,
            closes vim/vim#10098)
https://github.com/vim/vim/commit/5a6ec10cc80ab02eeff644ab19b82312630ea855

Cherry-pick tv_check_for_number_arg() from Vim.
Cherry-pick pathshorten() doc change.

vim-patch:9.0.0285: it is not easy to change the command line from a plugin

Problem:    It is not easy to change the command line from a plugin.
Solution:   Add setcmdline(). (Shougo Matsushita, closes vim/vim#10869)
https://github.com/vim/vim/commit/07ea5f1509fe8dafe3262ed2702b4d0fc99e288b

vim-patch:8.2.1536: cannot get the class of a character; emoji widths are wrong

Problem:    Cannot get the class of a character; emoji widths are wrong in
            some environments.
Solution:   Add charclass(). Update some emoji widths.  Add script to check
            emoji widths.
https://github.com/vim/vim/commit/4e4473c927167fd24e5c8df90e0e8035080cf2da

Use latest charclass() docs from Vim.
Rewrite DoIt() in emoji_list.vim in Lua.
Omit emoji table updates:
- emoji_width update looks wrong as these added ranges are only double-width when followed by 0xFE0F.
- Other updates are too old.

vim-patch:8.2.1540: the user cannot try out emoji character widths

Problem:    The user cannot try out emoji character widths.
Solution:   Move the emoji script to the runtime/tools directory.
https://github.com/vim/vim/commit/98945560c1ae6e2ddee820a7de718a36e3f4b6e5

Problem:    It is not possible to specify cell widths of characters.
Solution:   Add setcellwidths().
https://github.com/vim/vim/commit/08aac3c6192f0103cb87e280270a32b50e653be1

Co-Authored-By: delphinus <me@delphinus.dev>

Problem:    Menu functionality insufficiently tested.
Solution:   Add tests.  Add menu_info(). (Yegappan Lakshmanan, closes vim/vim#5760)
https://github.com/vim/vim/commit/0eabd4dc8ff50658f0ea0e92c7918a42242f6b80

Omit feedkeys() change: even if "L" flag is implemented it will likely
use input_enqueue(), which already checks for interrupts.

Omit Test_mouse_popup_menu(): already tested in Lua.

Problem:    Cannot easily restore a mapping.
Solution:   Add mapset().
https://github.com/vim/vim/commit/4c9243f9fb708c9010867d3cc8e928f36b58509a

Use MapArgument to reduce number of arguments of map_add().

N/A patches for version.c:

vim-patch:8.2.0809: build failure with small features

Problem:    Build failure with small features. (Tony Mechelynck)
Solution:   Move "expr" inside #ifdef.
https://github.com/vim/vim/commit/5a80f8ad5dc0b2cc63400255dcf3c63f6c1a2ef9

This change adds the necessary plumbing to annotate functions in funcs.c
as being allowed in run in luv fast events.

vim-patch:8.2.4903: cannot get the current cmdline completion type and position

Problem:    Cannot get the current cmdline completion type and position.
Solution:   Add getcmdcompltype() and getcmdscreenpos(). (Shougo Matsushita,
            closes vim/vim#10344)
https://github.com/vim/vim/commit/79d599b8772022af1d657f368c2fc97aa342c0da

vim-patch:8.2.4910: imperfect coding

Problem:    Imperfect coding.
Solution:   Make code nicer.
https://github.com/vim/vim/commit/9ff7d717aa3176de5c61de340deb93f41c7780fc