C-n runs the command picture-move-down (found in picture-mode-map), which is an interactive compiled Lisp function in ‘picture.el’. It is bound to C-n, <down>. (picture-move-down ARG) Move vertically down, making whitespace if necessary. With argument, move that many lines. [back]
In https://www.emacswiki.org/emacs/PictureMode, the author say:
What I don’t like is when people respond with “Use picture-mode.” when someone asks the question: “How do I make emacs position the cursor in the same column if I move up or down when the line I move to is shorter than the current one?” . Why don’t I like this? Because I have seen those questions and the answers many times and it is often obvious that the person asking the question does not want picture-mode at all. He wants that feature added as (for example) a minor-mode, to be used when editing source-code.
The author does not give us an answer about the question, hoping you guys could help me.