Unset `non-essential' in Tramp when not needed anymore

* doc/misc/trampver.texi:
* lisp/net/trampver.el: Change version to "2.3.2-pre".

* lisp/net/tramp-sh.el (tramp-maybe-open-connection):
Use `tramp-completion-mode-p'.

* lisp/net/tramp.el (tramp-file-name-handler): Unset `non-essential'
when file name doesn't match `tramp-completion-file-name-regexp'.

doc/misc/trampver.texi

@@ -8,7 +8,7 @@
 @c In the Tramp GIT, the version number is auto-frobbed from
 @c configure.ac, so you should edit that file and run
 @c "autoconf && ./configure" to change the version number.
-@set trampver 2.3.1
+@set trampver 2.3.2-pre
 
 @c Other flags from configuration
 @set instprefix /usr/local

lisp/net/tramp-sh.el

@@ -4653,12 +4653,11 @@ connection if a previous connection has died for some reason."
     (condition-case err
 	(unless (tramp-compat-process-live-p p)
 
-	  ;; If `non-essential' is non-nil, don't reopen a new connection.
-	  ;; This variable has been introduced with Emacs 24.1.
-	  ;; We check this for the process related to
+	  ;; During completion, don't reopen a new connection.  We
+	  ;; check this for the process related to
 	  ;; `tramp-buffer-name'; otherwise `start-file-process'
 	  ;; wouldn't run ever when `non-essential' is non-nil.
-	  (when (and (boundp 'non-essential) (symbol-value 'non-essential)
+	  (when (and (tramp-completion-mode-p)
 		     (null (get-process (tramp-buffer-name vec))))
 	    (throw 'non-essential 'non-essential))
 

lisp/net/tramp.el

@@ -2021,6 +2021,10 @@ Falls back to normal file name handler if no Tramp file name handler exists."
     (if (and tramp-mode (tramp-tramp-file-p filename))
 	(save-match-data
 	  (let* ((filename (tramp-replace-environment-variables filename))
+                 (non-essential
+                  (and non-essential
+                       (string-match
+                        tramp-completion-file-name-regexp filename)))
 		 (completion (tramp-completion-mode-p))
 		 (foreign
 		  (tramp-find-foreign-file-name-handler

lisp/net/trampver.el

@@ -6,7 +6,7 @@
 ;; Author: Kai Großjohann <kai.grossjohann@gmx.net>
 ;; Keywords: comm, processes
 ;; Package: tramp
-;; Version: 2.3.1
+;; Version: 2.3.2-pre
 
 ;; This file is part of GNU Emacs.
 
@@ -32,7 +32,7 @@
 ;; should be changed only there.
 
 ;;;###tramp-autoload
-(defconst tramp-version "2.3.1"
+(defconst tramp-version "2.3.2-pre"
   "This version of Tramp.")
 
 ;;;###tramp-autoload
@@ -54,7 +54,7 @@
 ;; Check for Emacs version.
 (let ((x (if (>= emacs-major-version 23)
     "ok"
-  (format "Tramp 2.3.1 is not fit for %s"
+  (format "Tramp 2.3.2-pre is not fit for %s"
 	  (when (string-match "^.*$" (emacs-version))
 	    (match-string 0 (emacs-version)))))))
   (unless (string-match "\\`ok\\'" x) (error "%s" x)))