Re: First stab at getting bar extents right. (issue 5186049)

[k-ohara5a5a]

// First stab at getting bar extents right.

Now, the bar extents are right already.
They correspond to the extend of the bar as printed.
For some reason, having the extents correct was
important enough to Pál that he made 51494aa2.

You want the bar to have influence beyond its visible extent, so that
accidentals do not cross over.
That is usually done with extra-spacing-height (for note spacing) or
some kind of padding.

Customize extra-spacing-height instead of extent.

http://codereview.appspot.com/5186049/