Ruler to scale with zoom?

[andrewkr]

If I zoom in to view part of a diagram (for instance) so that I can align the ruler to the top border of an element in the diagram that I'm creating, I would like the ruler to stay attached to that border. I wouldn't mind if it could scale as I zoom back out to view other parts of the diagram I'm creating.

I think that it used to do the second method previously, but I can't be sure.

In this example, the result I want is to have the ruler still giving me the position of that top border. The point of that is me needing to align other elements to that top border.

If I haven't made anything clear, please ask me to clarify it for you!