* lisp/eshell/em-glob.el (eshell-glob-chars-regexp): New function...
(eshell-glob-regexp): ... use it.
(eshell-glob-p): New function...
(eshell-glob-convert): ... use it, and return the deepest start
directory possible.

* lisp/eshell/esh-util.el (eshell-split-path): Rename to...
(eshell-split-path): ... this, and account for remote file names.

* test/lisp/eshell/em-glob-tests.el
(em-glob-test/convert/current-start-directory)
(em-glob-test/convert/relative-start-directory)
(em-glob-test/convert/absolute-start-directory)
(em-glob-test/convert/remote-start-directory): New tests (bug#69592).

* test/lisp/eshell/eshell-tests.el (eshell-test/flush-output):
Use eshell-delete-output instead of eshell-kill-output.

* lisp/eshell/esh-opt.el (eshell--get-option-symbols): New function...
(eshell-eval-using-options): ... use it.
(eshell--do-opts, eshell--process-args): Take OPTION-SYMS.

* test/lisp/eshell/esh-opt-tests.el (esh-opt-test/process-args):
(esh-opt-test/process-args-parse-leading-options-only):
(esh-opt-test/process-args-external): Pass OPTION-SYMS in.

* lisp/eshell/em-dirs.el (eshell-parse-user-reference): Don't expand
quoted tildes.

* test/lisp/eshell/em-dirs-tests.el
(em-dirs-test/expand-user-reference/local)
(em-dirs-test/expand-user-reference/quoted): New tests.

Normally, "echo<RET>" runs the command "echo".  Likewise,
"echo\<RET><RET>" should too: we escape the first newline, and then
the second one is unescaped and should send the command input to
Eshell.  Previously, you had to press RET a third time, but now it
works as expected.

* lisp/eshell/esh-arg.el (eshell-looking-at-backslash-return): Make
obsolete.
(eshell-parse-backslash): A backslash sequence is only incomplete if
there's nothing at all after it.

* test/lisp/eshell/esh-arg-tests.el (esh-arg-test/escape/newline)
(esh-arg-test/escape-quoted/newline): Remove inaccurate comment;
escaped newlines are always special.
(esh-arg-test/escape/trailing-newline): New test.

* lisp/eshell/em-basic.el (eshell/umask): Handle setting umask
symbolically, and make setting umask take precedence over "-S".

* test/lisp/eshell/em-basic-tests.el
(em-basic-test/umask-print-numeric, em-basic-test/umask-read-symbolic,
em-basic-test/umask-set): Rename to...
(em-basic-test/umask/print-numeric)
(em-basic-test/umask/print-symbolic, em-basic-test/umask/set-numeric):
... these.
(em-basic-test/umask/set-symbolic, em-basic-test/umask/set-with-S):
New tests.

* etc/NEWS: Announce this change.

This is particularly important when the inner command to execute is an
alias.  Aliases throw 'eshell-replace-command' too, so we want to do
this in two phases: first, replace the "sudo"/"doas" with a
let-binding of 'default-directory', and then later, let the alias code
do its own replacement (bug#68074).

* lisp/eshell/em-tramp.el (eshell/sudo, eshell/doas): Use
'eshell-replace-command' to wrap the inner command.
* test/lisp/eshell/em-tramp-tests.el (mock-eshell-named-command):
Remove.
(em-tramp-test/sudo-basic, em-tramp-test/sudo-user)
(em-tramp-test/doas-basic, em-tramp-test/doas-user): Catch
'eshell-replace-command'.

Note to self: coffee first, *then* push upstream.

* test/lisp/eshell/esh-cmd-tests.el
(esh-cmd-test--deftest-invoke-directly): Add missing docstring.

I think this regressed partly due to eef32d13da58, so let's add some
regression tests to make sure that doesn't happen again.

* lisp/eshell/em-unix.el (eshell-unix-initialize): Add "compile".

* lisp/eshell/esh-cmd.el (eshell--find-subcommands): Yield the second
element of the subcommand.
(eshell--invoke-command-directly-p): Rename and account for
'eshell-with-copied-handles'.
(eshell-invoke-directly): Rename to...
(eshell-invoke-directly-p): ... this, and use 'pcase' to make the
logic clearer.

* lisp/eshell/esh-mode.el (eshell-send-input): Always queue input if
the process is running; rename some locals to be clearer.

* lisp/eshell/esh-var.el (eshell-var-initialize): Add "env" as a
complex command.

* test/lisp/eshell/esh-cmd-tests.el
(esh-cmd-test--deftest-invoke-directly): New macro.
(no-args, with-args, multiple-cmds, subcmd, complex, complex-subcmd):
New test cases.