Using very long lines (tested with 8579 chars), there is a bug.
If you scroll horizontally the line, about after 8306 chars, the view jumps to the first characters.
I mean that instead of showing you the 8307 character, it scrolls back to the beginning characters (precisely, to column 5) and then it continue to scroll up to char 387 and there is blocks (the scroll bar reaches the right side).

IMPORTANT: This is true only if you scroll dragging the scroll bar, but not if you use the arrow buttons or the keyboard.