1. Vim9 error messages, ex commands, are N/A.
2. ":scriptversion" is N/A:
3. Most `#.*define.*ex_ni$` are N/A
because `FEAT_` compile guards are N/A.
----
Target patch: v8.2.2238
Actual patch list:
```
vim-patch:8.2.4240: error for using flatten() in Vim9 script is unclear
vim-patch:9.0.0170: various minor code formatting issues
vim-patch:9.1.0356: MS-Windows: --remote may change working directory
vim-patch:9.2.0251: Link error when building without channel feature
vim-patch:9.2.0714: Coverity warns for NULL deref
vim-patch:9.2.0818: tests: client-server test fails without X11 server
vim-patch:9.2.0868: GTK: Window Manager hint prevents giving focus to dialog
```
----
Ignore diff blanklines via regex ("-I"), not "--ignore-blank-lines".
Almost useless.
I tried with/without "--word-diff=porcelain", "--word-diff-regex",
and diff algorithms like `--histogram`.
Nvim diverged from Vim's ":version".
- no date
- different compiled features list
- different config file and directory
- no compiler flags
* build(vim-patch): n/a doc for balloon feature (8.2.3917)
Vim patches for Vim help files must use Vim tags as diff hunk header
to reliably detect if a hunk is N/A or not.
Git does not know which files are Vim help files
so that it can use custom "diff.<filetype>.xfuncname" regexp
to create the header.
Update Neovim's gitattributes to detect Vim help files
and then use it on vim-patch.sh to scan Vim patches.
Add non-function tags from ":h vim_diff"
to detect N/A Vim runtime patches.
