[PATCH] Initialize interval in grob_stencil_extent().

[Patrick McCarty]

Hello,

Is this patch correct?

The reason I ask is because, after applying this patch, the results of
`make check' show many spacing changes, and I don't know if those
changes occur because the patch is incorrect or if there are
spacing-related workarounds in the codebase that need to be adjusted.

Also, the new regtest `stem-length-estimation.ly' will need to be
reworked to fit all systems on one page again, and I'll take of that
if this patch is okay.

One example of the spacing changes is attached.

Thanks,
Patrick

0001-Initialize-interval-in-grob_stencil_extent.patch
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song-melisma.png
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song-melisma.compare.jpeg
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