Re: more problems with line-move

[Richard Stallman]

    >     But yes, we can sometimes reach point A and sometimes point B (both
    >     ends of a non-sticky invisible extent of text) depending on how the
    >     user gets to this text.  For sticky invisible text, this should
    >     not happen.

    > How does stickiness affect it?  Perhaps telling people to use stickiness
    > in certain ways is a solution.  Or perhaps this code should be changed
    > in regard to how it depends on stickiness.

    If the invisibility is sticky at one end, then this end is basically marked
    as "off-limits".

Is there a rationale for depending on stickiness in this way?

It seems to me that when all stickiness properties are nil, which is
the default case, we should get behavior similar to that of my
invisible-intangible patch.  Is that correct?