Don't lose the CIDER session over TRAMP files

Fixes #3250

CHANGELOG.md

@@ -22,6 +22,7 @@
 - [#3331](https://github.com/clojure-emacs/cider/issues/3331): `cider-eval`: never jump to spurious locations, as sometimes conveyed by nREPL.  
 - [#3112](https://github.com/clojure-emacs/cider/issues/3112): Fix the CIDER `xref-find-references` backend to return correct filenames.
 - [#3393](https://github.com/clojure-emacs/cider/issues/3393): recompute namespace info on each shadow-cljs recompilation or evaluation.
+- [#3250](https://github.com/clojure-emacs/cider/issues/3250): don't lose the CIDER session over TRAMP files. 
 - Fix the `xref-find-definitions` CIDER backend to return correct filenames.
 - Fix the `cider-xref-fn-deps` buttons to direct to the right file.
 - Make TRAMP functionality work when using non-standard ports.

cider-connection.el

@@ -613,6 +613,14 @@ REPL defaults to the current REPL."
   "Figure out if SESSION1 or SESSION2 is more relevant."
   (sesman-more-recent-p (cdr session1) (cdr session2)))
 
+(defun remove-string-prefix (prefix str)
+  "Remove PREFIX from the beginning of STR, if it is present.
+Otherwise, return the original string."
+  (if (and (string-prefix-p prefix str)
+           (>= (length str) (length prefix)))
+      (substring str (length prefix))
+    str))
+
 (declare-function cider-classpath-entries "cider-client")
 (cl-defmethod sesman-friendly-session-p ((_system (eql CIDER)) session)
   "Check if SESSION is a friendly session."
@@ -624,6 +632,8 @@ REPL defaults to the current REPL."
     (when (string-match-p "#uzip" file)
       (let ((avfs-path (directory-file-name (expand-file-name (or (getenv "AVFSBASE")  "~/.avfs/")))))
         (setq file (replace-regexp-in-string avfs-path "" file t t))))
+    (when-let ((tp (cider-tramp-prefix (current-buffer))))
+      (setq file (remove-string-prefix tp file)))
     (when (process-live-p proc)
       (let* ((classpath (or (process-get proc :cached-classpath)
                             (let ((cp (with-current-buffer repl