Making the first line invisible

[mptorney]

I'm trying to creating a diff viewer.  To show only the differences, I'm making all lines invisible, then I'm showing all of the lines with differences.  However, line 0 is always shown.  Am I missing something?

To reproduce this, just set Lines[0].IsVisible = false.

Also, if I make all the lines invisible and then make any line visible, only line 0 is visible.

[Neil Hodgson]

mptorney:

> I'm trying to creating a diff viewer.  To show only the differences, I'm
> making all lines invisible, then I'm showing all of the lines with
> differences.  However, line 0 is always shown.  Am I missing something?

The implementation relies on all invisible lines 'hanging off' a
visible line. Thus the first line has to be visible. If this invariant
is broken in 2012, code may break, seas may rise, and Tibet may be
flooded.

Neil