When qt_yn_function() or qt_more() is asking for a single character
response, typing anything will cause the prompt line in the message
window to stop being highlighted. If they reject what's been typed,
they beep (--More-- doesn't start beeping until second rejection);
change both of them to also rehighlight the prompt line to give a
visual indication that the question/acknowledgement is still being
asked.
The Qt interface highlights the last message issued (using a
mechanism for selection, as if for copy+paste or similar operation)
but it was staying highlighted until another message was eventually
given. Having an old message seem to stick around is annoying and
is particularly bad when the message is a prompt. If the player's
answer doesn't cause a message to be shown then it seems as if the
prompt is still pending.
This removes the highlighting (by bulk unselecting) once the player
gives another input keystroke or mouse click.
It would be much better if the selecting/highlighting was for all
messages issued since last time highlighting was cleared. Figuring
out how to do that correctly is more effort than I want to expend.
