>>> This is exactly what the patch does. Have you really tried it?
>>
>> Yes, I don't know what happened (I applied it manually), but I
>> must have made an error, because it didn't work.
>>
>> Then I checked the original code and I came up with the same
>> solution you did.
>>
>> So, yes, it does work. Thanks, and sorry for the confusion.
>
> Thanks for confirming, now this is fixed.

Actually, this is not so simple.  Currently this doesn't work with
multi-line minibuffer.  When there is non-prompt text on the previous line,
it should move point to the editable portion of that line.  So I pushed
this patch that supports not only multi-line minibuffer contents,
but also multi-line prompts.