Hi,

Here is a new patch for longlines-mode. It updates substring filtering
to the new interface and do not replace soft newlines with spaces
anymore. So now, copy/pasting from a longlines buffer should work as
intended.

I'm now trying to update the search/query-replace but I don't understand
how 'search-spaces-regex' works. It seems that with it I should be able
to jump above soft newlines during search, but how ?