Problem:    Unified diff fails if actually used.
Solution:   Invoke :diffupdate in the test.  Fix the check for working external
            diff. (Ghjuvan Lacambre, Christian Brabandt, closes vim/vim#8197)
https://github.com/vim/vim/commit/ad5c178a191cf2cf37a27c2a789d7afda3879831

Problem:    'wrap' option is always reset when starting diff mode.
Solution:   Add the "followwrap" item in 'diffopt'. (Rick Howe, closes vim/vim#7797)
https://github.com/vim/vim/commit/4223d43c0fb6ead1e611e4469a1680a9228b6015

"name" param was cast to (const char *).
All calls to set_string_option_direct() cast 1st arg
from (char *) to (char_u *).
Remove these useless casts.

Problem:    When "--remote file" is used "file" is not reloaded.
Solution:   When a :drop command is used for a file that is already displayed
            in a window and it has not been changed, check if it needs to be
            reloaded. (closes vim/vim#7560)
https://github.com/vim/vim/commit/e4862a0fe62261754daf476866ef2aa8586b716c

Remove unused "focus" parameter from "buf_check_timestamp()".
It was meant for removed GUI code.

Problem:    Many type casts are used for vim_strnsave().
Solution:   Make the length argument size_t instead of int. (Ken Takata,
            closes vim/vim#5633)  Remove some type casts.
https://github.com/vim/vim/commit/df44a27b53586fccfc6a3aedc89061fdd9a515ff

N/A patches for version.c:

vim-patch:8.2.0315: build failure on HP-UX system

Problem:    Build failure on HP-UX system.
Solution:   Use LONG_LONG_MIN instead of LLONG_MIN.  Add type casts for switch
            statement. (John Marriott)
https://github.com/vim/vim/commit/c593bec4120f122e8a9129ec461968f1bd214435

vim-patch:8.2.1052: build failure with older compilers

Problem:    Build failure with older compilers.
Solution:   Move declaration to start of block.
https://github.com/vim/vim/commit/7acde51832f383f9a6d2e740cd0420b433ea841a

vim-patch:8.2.2229: build failure without the +eval feature

Problem:    build failure without the +eval feature.
Solution:   Add #ifdef.
https://github.com/vim/vim/commit/39cb2dab18e85fc60f116a4543e433616872b690

vim-patch:8.2.2232: compiler error for falling through into next case

Problem:    Compiler error for falling through into next case.
Solution:   Move FALLTHROUGH below the #endif
https://github.com/vim/vim/commit/9618a25b9c054f0ee4e267d2db96b6e7c113ed7a

Problem:    Too many #ifdefs.
Solution:   Graduate FEAT_MBYTE, part 1.
https://github.com/vim/vim/commit/135059724f140ceac889c9f8136bd1bf5c41d49d

co-author: hlpr98 <hlpr98@gmail.com> (dict2hlattrs function)

orange is sus??

NOVEMBER DAWN

erase the lie that is redraw_later()

Problem:    Using old C style comments.
Solution:   Use // comments where appropriate.
https://github.com/vim/vim/commit/5d18efecfd6c45d69f55268948a22cd0465bb955

fix #11975

Similar to signcolumn, allow foldcolumn to adapt itself to the number of
folds.

Regression:
vim supports a maximum fdc of 12, this limits it to 9.