emacs-29 11c3c54d8a: Fix handling of relative directories in "--init-directory=DIR"

[Eli Zaretskii]

branch: emacs-29
commit 11c3c54d8ade69003f441918b607f073e6fa39f1
Author: Eli Zaretskii <eliz@gnu.org>
Commit: Eli Zaretskii <eliz@gnu.org>

    Fix handling of relative directories in "--init-directory=DIR"
    
    * lisp/startup.el (command-line): Interpret non-absolute file
    names in '--init-directory' relative to the directory from
    which Emacs is started.  (Bug#59795)
---
 lisp/startup.el | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lisp/startup.el b/lisp/startup.el
index d985d57d3c..6270de2ace 100644
--- a/lisp/startup.el
+++ b/lisp/startup.el
@@ -1261,7 +1261,9 @@ please check its value")
          (setq user-emacs-directory (or argval (pop args))
                 user-emacs-directory (if (stringp user-emacs-directory)
                                          (file-name-as-directory
-                                          user-emacs-directory)
+                                          (expand-file-name
+                                           user-emacs-directory
+                                           command-line-default-directory))
                                        user-emacs-directory)
                 argval nil))
         ((member argi '("-u" "-user"))