Improve performance when checking case-sensitivity of Tramp file names

* lisp/net/tramp-sh.el (tramp-sh-handle-expand-file-name):
Dissect file name before testing for connectability to reduce
duplicated work.

* lisp/net/tramp.el (tramp-handle-file-name-case-insensitive-p):
Use `tramp-connectable-p' to test for connection.

2 files changed, 6 insertions, 6 deletions

diff --git a/lisp/net/tramp-sh.el b/lisp/net/tramp-sh.el
index 62921909406..b20e5f80732 100644
--- a/lisp/net/tramp-sh.el
+++ b/lisp/net/tramp-sh.el
@@ -2705,11 +2705,11 @@ the result will be a local, non-Tramp, file name."
     ;; Unless NAME is absolute, concat DIR and NAME.
     (unless (file-name-absolute-p name)
       (setq name (tramp-compat-file-name-concat dir name)))
-    ;; If connection is not established yet, run the real handler.
-    (if (not (tramp-connectable-p name))
-        (tramp-run-real-handler #'expand-file-name (list name nil))
-      ;; Dissect NAME.
-      (with-parsed-tramp-file-name name nil
+    ;; Dissect NAME.
+    (with-parsed-tramp-file-name name nil
+      ;; If connection is not established yet, run the real handler.
+      (if (not (tramp-connectable-p v))
+          (tramp-run-real-handler #'expand-file-name (list name nil))
         (unless (tramp-run-real-handler #'file-name-absolute-p (list localname))
           (setq localname (concat "~/" localname)))
         ;; Tilde expansion if necessary.  This needs a shell which
diff --git a/lisp/net/tramp.el b/lisp/net/tramp.el
index b152584c1f8..a8972ce69e8 100644
--- a/lisp/net/tramp.el
+++ b/lisp/net/tramp.el
@@ -3484,7 +3484,7 @@ User is always nil."
      (tramp-get-method-parameter v 'tramp-case-insensitive)
 
      ;; There isn't.  So we must check, in case there's a connection already.
-     (and (file-remote-p filename nil 'connected)
+     (and (let ((non-essential t)) (tramp-connectable-p v))
           (with-tramp-connection-property v "case-insensitive"
             (ignore-errors
               (with-tramp-progress-reporter v 5 "Checking case-insensitive"