I found something interesting:

Open word (it also happens in Q10 text editor):

1, write 'a' characters almost till the end of the first line

2, hit space and write another word, which will move to the next line after some chars typed (remember when)

3, move back to the position where your second word moved to second line (so if you have the word something, and some would fit in the first line, move the caret after some)

4, now hit space a couple of times...

Now nothing happens :D oh well..word will add these spaces at the end of the first line..so if you added like 50spaces and move left, your caret will go somewhere far on the right part of first line and become invisible...if you hit left enough, it will come back to the canvas.

In Q10 it also happens but the cursor will go back to the first line, and remain in the last position instead of dissapearing like in word.

I don't know if this is a bug or just strange behaviour...what do you think?

I am asking because I am writing my own editor in processing, and now I programmed it to act like the same..but what should really happen in this case? (I still have some stuff to fix about the caret).