So that combining it with `shift` selects the text, as usual, in case
you have it bound for example to `C-a` in a mode like `enriched-mode`.
fill-prefix, and any indentation used for centering or right-justifying the
line, but does not move past any whitespace that was explicitly inserted
\(such as a tab used to indent the first line of a paragraph)."
- (interactive "p")
+ (interactive "^p")
(beginning-of-line n)
(skip-chars-forward " \t")
;; Skip over fill-prefix.