bug#53715: 29.0.50; [PATCH] Improve correctness of pipelines in Eshell

[Lars Ingebrigtsen]

Jim Porter <jporterbugs@gmail.com> writes:

> This happens because Eshell only keeps track of the tail process when
> running an external process, so when sending stdin, it gets sent to
> the tail process (`rev'), not the head (`tr'). I fixed this in the
> second patch by recording both the head and tail processes and
> updating the various places that use the current process to use the
> right one.

These patches seem to lead to a number of tests failing:

Test eshell-test/last-result-var2 condition:
    (void-variable eshell-last-async-proc)
   FAILED  22/34  eshell-test/last-result-var2 (0.001074 sec) at 
lisp/eshell/eshell-tests.el:164
   passed  23/34  eshell-test/lisp-command (0.000350 sec)
   passed  24/34  eshell-test/lisp-command-args (0.000308 sec)


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