Implement file name handler for `file-name-case-insensitive-p'

* doc/lispref/files.texi (Truenames): `file-name-case-insensitive-p'
is also applicable for remote hosts.

* lisp/net/tramp.el (tramp-methods): Improve docstring.
(tramp-file-name-for-operation): Add `file-name-case-insensitive-p'.
(tramp-handle-file-name-case-insensitive-p): New defun.

* lisp/net/tramp-smb.el (tramp-methods) <smb>:
Add `tramp-case-insensitive' entry.

* lisp/net/tramp-adb.el (tramp-adb-file-name-handler-alist)
* lisp/net/tramp-gvfs.el (tramp-gvfs-file-name-handler-alist)
* lisp/net/tramp-sh.el (tramp-sh-file-name-handler-alist)
* lisp/net/tramp-smb.el (tramp-smb-file-name-handler-alist)
<file-name-case-insensitive-p>: Add handler.  (Bug#22300, Bug#24441)

1 files changed, 3 insertions, 1 deletions

diff --git a/doc/lispref/files.texi b/doc/lispref/files.texi
index 70c7177e064..e189da9fbe2 100644
--- a/doc/lispref/files.texi
+++ b/doc/lispref/files.texi
@@ -1154,7 +1154,9 @@ on Mac OS X.
 Currently this function always returns @code{nil} on platforms other
 than MS-DOS, MS-Windows, Cygwin, and Mac OS X.  It does not detect
 case-insensitivity of mounted filesystems, such as Samba shares or
-NFS-mounted Windows volumes.
+NFS-mounted Windows volumes.  On remote hosts, it assumes @code{t} for
+the @samp{smb} method.  For all other connection methods, runtime
+tests are performed.
 @end defun
 
 @defun file-in-directory-p file dir