So, I found a way to ease the problem: editing the file /etc/inputrc to add
set horizontal-scroll-mode on
I'm now able to at least see the whole line being typed.
That is still not a solution, but it works nethertheless.
If anyone ever finds out the reason to why bash's readline fails to wrap the input line, please reply this post.
For the moment, I won't mark the post as answer because it's not a fix, only a work arround.
DAVI