Does/should moodle refresh to login page (like banks) when session expires?

[moodle.org forums no longer let me start discussions ?? so added issue here :-( ]

I ask this, because users are likely to return to moodle pages when the session has expired & click things (like collapsed topics) & generate errors like this:

[08-Nov-2013 10:29:24 Europe/London] Default exception handler: Incorrect sesskey submitted, form not accepted! Debug:
Error code: invalidsesskey

• line 463 of \lib\setuplib.php: moodle_exception thrown
• line 33 of \lib\ajax\setuserpref.php: call to print_error()

I’m testing mdl 2.6 beta+ with topcol & bootstrap Clean with docking but I thought this could become a more general issue in future