[Bug 269292] shells/zsh fails to reset tty state on TMOUT

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=269292

            Bug ID: 269292
           Summary: shells/zsh fails to reset tty state on TMOUT
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: bapt@FreeBSD.org
          Reporter: fbsd@opal.com
             Flags: maintainer-feedback?(bapt@FreeBSD.org)
          Assignee: bapt@FreeBSD.org

Created attachment 239865
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=239865&action=edit
patch to make zsh reset tty modes on TMOUT

shells/zsh fails to reset the tty state if it exits due to TMOUT expiration.

Repeat by:
$ zsh
$ stty -a
speed 9600 baud; 60 rows; 119 columns;
lflags: icanon isig iexten echo echoe -echok echoke -echonl echoctl
        -echoprt -altwerase -noflsh -tostop -flusho -pendin -nokerninfo
        -extproc
iflags: -istrip icrnl -inlcr -igncr ixon -ixoff ixany imaxbel -ignbrk
        brkint -inpck -ignpar -parmrk
oflags: opost onlcr -ocrnl tab0 -onocr -onlret
cflags: cread cs8 -parenb -parodd hupcl -clocal -cstopb -crtscts -dsrflow
        -dtrflow -mdmbuf rtsdtr
cchars: discard = ^O; dsusp = ^Y; eof = ^D; eol = <undef>;
        eol2 = <undef>; erase = ^?; erase2 = ^H; intr = ^C; kill = ^U;
        lnext = ^V; min = 1; quit = ^\; reprint = ^R; start = ^Q;
        status = ^T; stop = ^S; susp = ^Z; time = 0; werase = ^W;
$ TMOUT=2
$
.. wait for timeout..
zsh: timeout
$ stty -a
speed 9600 baud; 60 rows; 119 columns;
lflags: icanon isig iexten echo echoe -echok echoke -echonl echoctl
        -echoprt -altwerase -noflsh -tostop -flusho -pendin -nokerninfo
        -extproc
iflags: -istrip icrnl inlcr -igncr ixon -ixoff ixany imaxbel -ignbrk
        brkint -inpck -ignpar -parmrk
oflags: opost onlcr -ocrnl tab0 -onocr -onlret
cflags: cread cs8 -parenb -parodd hupcl -clocal -cstopb -crtscts -dsrflow
        -dtrflow -mdmbuf rtsdtr
cchars: discard = <undef>; dsusp = <undef>; eof = ^D; eol = <undef>;
        eol2 = <undef>; erase = ^?; erase2 = ^H; intr = ^C; kill = ^U;
        lnext = <undef>; min = 1; quit = <undef>; reprint = ^R;
        start = ^Q; status = ^T; stop = ^S; susp = <undef>; time = 0;
        werase = ^W;

Observe that lots of chars are now <undef> and iflag inlcr is now set when it
wasn't before.

I am attaching a simple patch to fix this.

This should probably be sent upstream too.

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