Re: [PATCH v2 0/4] a couple of read_key_without_echo() fixes

> I have added a new patch to the beginning of the series that fixes a case
> where we did not call restore_term() when leaving read_key_without_echo(). I
> have also reworded the commit message to patch 2 as SIGINT is actually
> ignored while the editor is running (we should probably change that code to
> use wait_after_clean instead).

>
> Cover letter for V1:
>
> Fix a couple of bugs I noticed when using the builtin "add -p" with
> interactive.singlekey=true. The first patch is a general fix for the
> terminal save/restore functionality which forgot to call sigchain_pop() when
> it restored the terminal. The last two fix reading single keys in
> non-canonical mode by making sure we wait for an initial key press and only
> read one byte at a time from the underlying file descriptor.
>
> Note that these are untested on windows beyond our CI compiling them
>
> Phillip Wood (4):
>   terminal: always reset terminal when reading without echo
>   terminal: pop signal handler when terminal is restored
>   terminal: set VMIN and VTIME in non-canonical mode
>   add -p: disable stdin buffering when interactive.singlekey is set
>
>  add-interactive.c |  2 ++
>  compat/terminal.c | 29 +++++++++++++++++++++++------
>  compat/terminal.h |  8 ++++++++
>  3 files changed, 33 insertions(+), 6 deletions(-)
>
>
> base-commit: b80121027d1247a0754b3cc46897fee75c050b44
> Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-1146%2Fphillipwood%2Fwip%2Fadd-p-vmin-v2-v2
> Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-1146/phillipwood/wip/add-p-vmin-v2-v2
> Pull-Request: https://github.com/gitgitgadget/git/pull/1146
>
> Range-diff vs v1:
>
>  -:  ----------- > 1:  45609d61afc terminal: always reset terminal when reading without echo
>  1:  9a3c2cea0f9 ! 2:  0020953f1cf terminal: pop signal handler when terminal is restored
>      @@ Commit message
>           external caller was removed by e3f7e01b50 ("Revert "editor: save and
>           reset terminal after calling EDITOR"", 2021-11-22). Any future callers
>           of save_term() should benefit from having the signal handler set up
>      -    for them. For example if we reinstate the code to protect against an
>      -    editor failing to restore the terminal attributes we would want that
>      -    code to restore the terminal attributes on SIGINT. (As an aside
>      -    run_command() installs a signal handler that waits for the child
>      -    before re-raising the signal so we would be guaranteed to restore the
>      -    settings after the child has exited.)
>      +    for them.
>       
>           Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
>       
>  2:  02009172e08 = 3:  7ae9b236554 terminal: set VMIN and VTIME in non-canonical mode
>  3:  6d8423b6e1e = 4:  39b061a471b add -p: disable stdin buffering when interactive.singlekey is set