[PATCH 0/4] builtin add -p: hopefully final readkey fixes

[Phillip Wood <phillip.wood123@gmail.com>]

From: Phillip Wood <phillip.wood@dunelm.org.uk>

Fix the remaining issues that I'm aware of when using the built in
"add -p" with interactive.singlekey that are stopping it from being
merged to master. The first three patches make sure that we call
tcsetattr() and the same file descriptor that we use for read() and
work around poll() being broken when reading from terminals on
macos. The final patch is more of an improvement rather than a bug fix
(the same issue already exists in the perl version) and could proceed
separately.

Unfortunately these patches conflict with
'cb/save-term-across-editor-invocation' as well as the textual
conflicts there is a semantic conflict as the argument to save_term()
is changed so the code in editor.c will need updating.

These patches are based on 'pw/single-key-interactive'

Phillip Wood (4):
  terminal: use flags for save_term()
  terminal: don't assume stdin is /dev/tty
  terminal: work around macos poll() bug
  terminal: restore settings on SIGTSTP

 compat/terminal.c | 205 +++++++++++++++++++++++++++++++++++++++-------
 compat/terminal.h |   6 +-
 2 files changed, 182 insertions(+), 29 deletions(-)

-- 
2.35.1