Fixed client buffer reallocation for HTTP/3. Preserving pointers within the client buffer is not needed for HTTP/3 because all data is either allocated from pool or static. Unlike with HTTP/1, data typically cannot be referenced directly within the client buffer. Trying to preserve NULLs or external pointers lead to broken pointers. Also, reverted changes in ngx_http_alloc_large_header_buffer() not relevant for HTTP/3 to minimize diff to mainstream.

if exists("b:did_indent")
    finish
endif
let b:did_indent = 1

setlocal indentexpr=

" cindent actually works for nginx' simple file structure
setlocal cindent
" Just make sure that the comments are not reset as defs would be.
setlocal cinkeys-=0#