Move point to beginning of current line as displayed.
(If there's an image in the line, this disregards newlines
which are part of the text that the image rests on.)
With argument ARG not nil or 1, move forward ARG - 1 lines first.
If point reaches the beginning or end of buffer, it stops there.
To ignore intangibility, bind `inhibit-point-motion-hooks' to t.