* lisp/eshell/em-glob.el (eshell-glob-convert): Return whether to
match directories only.
(eshell-glob-entries): Add ONLY-DIRS argument.
* test/lisp/eshell/em-glob-tests.el
(em-glob-test/match-any-directory): New test.
(em-glob-test/match-recursive)
(em-glob-test/match-recursive-follow-symlinks): Add test cases for
when "**/" or "***/" are the last components in a glob.
* etc/NEWS: Announce this change (bug#56227).
* lisp/eshell/em-glob.el (eshell-glob-recursive): New variable.
(eshell-glob-convert-1, eshell-glob-convert): New functions.
(eshell-extended-glob): Use 'eshell-glob-convert'.
(eshell-glob-entries): Adapt function to use pre-converted globs.
* test/lisp/eshell-em-glob-tests.el (em-glob-test/match-dot-files):
New test.
* lisp/eshell/em-glob.el (eshell-extended-glob): Fix docstring.
(eshell-glob-entries): Refer to '**/' in error (technically, '**' can
end a glob, but it means the same thing as '*'). (Bug#54470)
* test/lisp/eshell/em-glob-tests.el: New file.
* doc/misc/eshell.texi (Globbing): Document pattern-based globs.
