Re: [Bug] comparisson operator `[[` not working as expected

[Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx>]

On Mon, Jun 20, 2022 at 11:33 AM Paulo Diovani <paulo@xxxxxxxxxxx> wrote:
>
> In version 5.9 the [[ ]] operator is behaving unexpectedly for the following case:

Yep, this is a bug, introduced when a different crashing bug was
fixed.  It's an off-by-one error skipping the first job in the table.

The relevant ChangeLog entry for the crash bug is

2022-03-30  Peter Stephenson  <p.stephenson@xxxxxxxxxxx>

        * 49906 (Bart), 49911: Doc/Zsh/builtins.yo,
        Doc/Zsh/mod_parameter.yo, Src/exec.c, Src/jobs.c,
        Test/W03jobparameters.ztst: Fix querying jobs in subshell.

diff --git a/Src/jobs.c b/Src/jobs.c
index e0e453ed8..25ceb81c4 100644
--- a/Src/jobs.c
+++ b/Src/jobs.c
@@ -2402,7 +2402,7 @@ bin_fg(char *name, char **argv, Options ops, int func)
            int curmaxjob, ignorejob;
            if (unset(MONITOR) && oldmaxjob) {
                jobptr = oldjobtab;
-               curmaxjob = oldmaxjob ? oldmaxjob - 1 : 0;
+               curmaxjob = oldmaxjob ? oldmaxjob : 0;
                ignorejob = 0;
            } else {
                jobptr = jobtab;