Sync with Tramp 2.2.6-pre.
* net/tramp.el (tramp-drop-volume-letter): Provide an XEmacs compatible declaration. * net/tramp-cmds.el (tramp-append-tramp-buffers): Protect `list-load-path-shadows' call. * net/tramp-compat.el (top): Require packages, which aren't autoloaded anymore for XEmacs. Protect call of `tramp-file-name-handler' by `tramp-compat-funcall', pacifying the compiler. Do not require tramp-util.el and tramp-vc.el anymore, it hurts at least for SXEmacs. (tramp-compat-temporary-file-directory): In XEmacs, there is no standard-value for `temporary-file-directory'. * net/tramp-sh.el (tramp-do-directory-files-and-attributes-with-stat): Redirect stderr to /dev/null. (tramp-sh-handle-write-region): uid and gid can be floats. Reported by Russell Sim <email@example.com>. (tramp-sh-handle-vc-registered): Hide errors. (tramp-vc-file-name-handler): Use dummy results for `process-file' and `start-file-process'. (tramp-maybe-open-connection): Check also whether `non-essential' is bound.
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