Problem:    search() loops forever if "skip" is TRUE for all matches.
Solution:   Keep the position of the first match.

https://github.com/vim/vim/commit/3d79f0a4309995956bd8889940cca22f7a15881d

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

A blob is used as a sequence of bytes and usually accessed individually,
not as as a NUL-terminuated string, so uint8_t should be better.

Not sure about ga_append(), but using uint8_t leads to fewer casts.

refactor: replace char_u with char

Work on https://github.com/neovim/neovim/issues/459

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>

refactor: replace char_u with char

Work on https://github.com/neovim/neovim/issues/459

Work on https://github.com/neovim/neovim/issues/459

Work on https://github.com/neovim/neovim/issues/459

Problem:    Various white space and cosmetic mistakes.
Solution:   Change spaces to tabs, improve comments.

https://github.com/vim/vim/commit/6ed545e79735f23ff8e650bc2f0967e5a0baedc9

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