file istream: If trying to seek backwards in unseekable stream, panic. The previous way of just setting an error flag was getting ignored too easily and causing silent corruption in such situations.
file istream: If trying to seek backwards in unseekable stream, panic.
The previous way of just setting an error flag was getting ignored too
easily and causing silent corruption in such situations.

--HG--
branch : HEAD

dscho/dovecot,dscho/dovecot,dscho/dovecot,dscho/dovecot,dscho/dovecot