Re: [PATCH] mingw: workaround for hangs when sending STDIN

> 3) Make `poll()` always reply "writable" for write end of the pipe
>    Afterall it seems that cygwin (accidentally?) does that for years.
>    Also, it should be noted that `pump_io_round()` writes 8MB blocks,
>    completely ignoring the fact that pipe's buffer size is only 8KB,
>    which means that pipe gets clogged many times during that single
>    write. This may invite a deadlock, if child's STDERR/STDOUT gets
>    clogged while it's trying to deal with 8MB of STDIN. Such deadlocks
>    could  be defeated with writing less then pipe's buffer size per

>    round, and always reading everything from STDOUT/STDERR before
>    starting next round. Therefore, making `poll()` always reply
>    "writable" shouldn't cause any new issues or block any future
>    solutions.
> 4) Increase the size of the pipe's buffer
>    The difference between `BytesInQueue` and `QuotaUsed` is the size
>    of pending reads. Therefore, if buffer is bigger then size of reads,

>    `poll()` won't hang so easily. However, I found that for example
>    `strbuf_read()` will get more and more hungry as it reads large inputs,
>    eventually surpassing any reasonable pipe buffer size.
> diff --git a/t/t3903-stash.sh b/t/t3903-stash.sh
> +test_expect_success 'stash handles large files' '
> +       printf "%1023s\n%.0s" "x" {1..16384} >large_file.txt &&
> +       git stash push --include-untracked -- large_file.txt
> +'