[PATCH] fix to issue 1116

[Mike Solomon]

cold week in Paris = lilypond week
my best stab at fixing 1116

This solution works for the minimal example given with the issue, and it
works in general if one accepts the assumption that there is no reason that
anything fed through stack-lines (in scm/stencil.scm) should have an X
extent whose left boundary is anything other than 0.  However, I
don'tunderstand lilypond well enough to know:

a) if this is a good assumption
b) if this assumption breaks something else.

As usual, the first person who throws this on Reitveld gets many thanks.

~Mike

0002-Fixes-issue-1116-by-regulating-X-extent-at-exit-of-s.patch
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