Coming back to a file or selection that already had turns showed "New
topic: <same file>. Earlier messages are not sent with these questions."
and sent none of them, so "Und was noch?" got "Ja, und noch." The divider
now reads "Back to: X. Earlier messages about it are sent again." (German
"Zurück zu: X. ..." for a German question), and the request carries the
earlier turns of that topic again. Turns of other topics still stay out.
A short follow-up right after a change of topic ("und", "mehr", "und was
noch?", "and?", "more") has no turn of its topic to follow. It is now
answered without the model: earlier messages were about another topic and
are not sent, please ask the full question, with the example questions of
a prompt that asks nothing.
The chat check for K17 now expects the return to send the file's own
earlier question and to say "Zurück zu".
Signed-off-by: Bernhard Jackiewicz <bj@techport.io>