Typing newlines into end of notepad causes jitter

[wheelercj]

When the caret is at the end of all text in the notepad (including whitespace characters), pressing enter (or return) makes the caret move down 2 lines and then up 1 line. There's only a brief moment where the caret is a line lower than where it should be, but it's still distracting, especially when the scroll bar is visible since this bug makes the entire view scroll 2 lines down and then 1 line up. Pressing enter/return should just add one line.