Handle 'eshell-pipe-broken' when evaluating Lisp forms in Eshell

* lisp/eshell/esh-cmd.el (eshell-exec-lisp): Handle
'eshell-pipe-broken'.

* lisp/eshell/esh-io.el (eshell-output-object-to-target): Only signal
'eshell-pipe-broken' if the process being written to has finished.

* test/lisp/eshell/esh-proc-tests.el
(esh-proc-test/pipeline-connection-type/middle)
(esh-proc-test/pipeline-connection-type/last): Remove ':unstable'.

Ref: https://lists.gnu.org/archive/html/emacs-devel/2022-08/msg00524.html

1 files changed, 0 insertions, 4 deletions

diff --git a/test/lisp/eshell/esh-proc-tests.el b/test/lisp/eshell/esh-proc-tests.el
index 62e784e8f62..2369bb5cc00 100644
--- a/test/lisp/eshell/esh-proc-tests.el
+++ b/test/lisp/eshell/esh-proc-tests.el
@@ -74,8 +74,6 @@
 (ert-deftest esh-proc-test/pipeline-connection-type/middle ()
   "Test that all streams are pipes when a command is in the middle of a
 pipeline."
-  ;; Repeated unreproducible errors.
-  :tags '(:unstable)
   (skip-unless (and (executable-find "sh")
                     (executable-find "cat")))
   (eshell-command-result-equal
@@ -84,8 +82,6 @@ pipeline."
 
 (ert-deftest esh-proc-test/pipeline-connection-type/last ()
   "Test that only output streams are PTYs when a command ends a pipeline."
-  ;; Repeated unreproducible errors.
-  :tags '(:unstable)
   (skip-unless (executable-find "sh"))
   (eshell-command-result-equal
    (concat "echo | " esh-proc-test--detect-pty-cmd)