* doc/misc/tramp.texi (Predefined connection information): A session
timeout is suppressed if there is a modified buffer, or a buffer
under auto-revert.
(Traces and Profiles): Tramp messages are written to the *Messages*
buffer when level is less than or equal to 3.
* lisp/net/tramp-sh.el (tramp-timeout-session): Do not timeout
when buffer is modified, or in auto-revert mode.
* test/lisp/net/tramp-tests.el (tramp-test48-session-timeout):
Extend test.
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