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One more pipeline glitch

X-seq: zsh-workers 50930
From: Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx>
To: Zsh hackers list <zsh-workers@xxxxxxx>
Subject: One more pipeline glitch
Date: Wed, 9 Nov 2022 22:18:18 -0800
Archived-at: <https://zsh.org/workers/50930>
List-id: <zsh-workers.zsh.org>

There had to be, right?

Consider:

{ sleep 5; sleep 6 } | { sleep 12; print $? }

If this is ^Z'd, "sleep 12" goes into the background and a new shell
is spawned (and immediately stopped) to handle "print $?".

Upon fg (after workers/50922), "sleep 12" is resumed and the subshell
remains stopped.  When the sleep finishes, the subshell is
foregrounded ...

... and prints 148 (SIGCONT).  This is, I guess, OK, but it means that
if we instead write

{ sleep 12 && print $? }

then print is not executed because the status of sleep appears to be nonzero.

What should we do here?

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