Problem:    Using sizeof() and subtract array size is tricky.
Solution:   Use offsetof() instead. (closes vim/vim#11926)

https://github.com/vim/vim/commit/1b438a8228a415720efb5ca1c0503f5467292e8e

This value can not be relied on as it doesn't work for
multi-configuration generators. I don't think this undocumented option
is used much, if at all, so I think we should remove it.

Problem:    Code is indented more than necessary.
Solution:   Use an early return where it makes sense. (Yegappan Lakshmanan,
            closes vim/vim#11887)

https://github.com/vim/vim/commit/142ed77898facf8f423fee2717efee1749c55f9a

Omit function_using_block_scopes(): only affects Vim9 script.

Co-authored-by: Yegappan Lakshmanan <yegappan@yahoo.com>

Problem:    Completion of :runtime does not handle {where} argument.
Solution:   Parse the {where} argument. (closes vim/vim#11863)

https://github.com/vim/vim/commit/3770f4c9cde7b5fcd10b6fa2e665cd0b69450fb2

Problem:    Code is indented more than necessary.
Solution:   Use an early return where it makes sense. (Yegappan Lakshmanan,
            closes vim/vim#11879)

https://github.com/vim/vim/commit/032713f8299abd92fcfb1e490d1ae5c1ecadde41

Co-authored-by: Yegappan Lakshmanan <yegappan@yahoo.com>