MH-E: set default-directory to HOME on entry

* lisp/mh-e/mh-e.el (mh-default-directory, mh-set-default-directory):
New variable (defaults to "~/"), new function to use it.
* lisp/mh-e/mh-folder.el (mh-rmail, mh-nmail): Call
mh-set-default-directory on entry to MH-E (closes: bug#77263).

lisp/mh-e/mh-e.el

@@ -144,6 +144,10 @@ This directory contains, among other things, the mhl program.")
 ;;;###autoload
 (put 'mh-lib-progs 'risky-local-variable t)
 
+(defvar mh-default-directory "~/"
+  "Default directory for MH-E folder buffers.
+Set to nil to have MH-E buffers inherit default-directory.")
+
 ;; Profile Components
 
 (defvar mh-draft-folder nil
@@ -438,6 +442,12 @@ gnus-version)
              (error "Bad element: %s" element))))
     new-list))
 
+(defun mh-set-default-directory ()
+  "Set `default-directory' to `mh-default-directory' unless it is nil."
+  (when (stringp mh-default-directory)
+    (setq default-directory (file-name-as-directory
+                             (expand-file-name mh-default-directory)))))
+
 
 
 ;;; MH-E Process Support

lisp/mh-e/mh-folder.el

@@ -51,9 +51,12 @@ the MH mail system."
   (interactive "P")
   (mh-find-path)
   (if arg
-      (call-interactively 'mh-visit-folder)
+      (progn
+        (call-interactively 'mh-visit-folder)
+        (mh-set-default-directory))
     (unless (get-buffer mh-inbox)
-      (mh-visit-folder mh-inbox (symbol-name mh-unseen-seq)))
+      (mh-visit-folder mh-inbox (symbol-name mh-unseen-seq))
+      (mh-set-default-directory))
     (mh-inc-folder)))
 
 ;;;###autoload
@@ -67,7 +70,8 @@ the MH mail system."
   (mh-find-path)                        ; init mh-inbox
   (if arg
       (call-interactively 'mh-visit-folder)
-    (mh-visit-folder mh-inbox)))
+    (mh-visit-folder mh-inbox))
+  (mh-set-default-directory))
 
 
 ;;; Desktop Integration