Re: moving point over invisible and intangible text

[Richard Stallman]

      There are two different sorts of line we have to worry
    about here, primarily display lines (to which invisibility applies), but
    also logical lines in the buffer (to which it doesn't); move-to-column
    should probably it should _try_ to behave consistently with respect to
    _both_ sorts of lines, but if that's impossible, prefer display lines.

I think move-to-column should probably pay most attention
to logical lines in the buffer.

      If line2's invisibility
    included some more characters at the beginning of line3, then I think
    (...m-t-c 0) should move to the first _visible_ character on line3.  If
    line2's invisibility _also_ includes the _preceding_ newline, causing
    line1 and line3 be displayed as if they were one line, then (...m-t-c 0)
    should probably move to the beginning of line1.

That is a coherent operation, but I don't think move-to-column should
do this.