Uaaah, the obvious thing.
You are correct, every returned input has '\cM' appended, with the obvious exception of the menues.
Thank You. Now I have a hint to continue.
Edit:
Looking at the code, the regex "/\A\R\z/" is used to identify the return key. Of course, this matches '\r'. Afterwards exactly this character is appended to the input and spoils enter-handling.
As a quick hack, I modified Prompter.pm, line 1379, the following way:
# Add newline to the accumulated input string...
#$input .= $next;
$input .= "\n";
This seems to help me, but is a hack
And it came to pass that in time the Great God Om spake unto Brutha, the Chosen One: "Psst!"
(Terry Pratchett, Small Gods)
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