The bug is that preview is inserting a null byte into the query string
on every call. Two calls, two null bytes; three calls, three null
bytes. One ever responded to by bug report. Changes in the new
release were made to allow null bytes in query strings, so possibly
the old code masked the error and the new code reveals it.
Hm... What for null byte is inserting? IMHO result of function
std::string.c_str() everywhere is a zero terminated string.
I comment line
*this << std::ends;
in Query::str(...), and it's working. At least for me (Linux, gcc 4.1.1) and
at least for simple queries.
.cpp