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If we perform a linejoin that ends up being over an impossibly small
distance, we can get a rendering error. This is caused by trying to
calculate scale = linewidth/sqrtf(len), where len < FLT_EPSILON.
Avoid this by rearranging the code slightly - no extra calculations
required.
Also given that sn == bn at all times within the stroking code, just
remove bn.
Credit for spotting this problem goes to Simon for tracking the
problem with rounding_artifact_due_to_closepath.pdf. My fix just
fixes the problem at a lower level than his does.
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The bug fix added in the previous commit fails to work in this
case (hang-9527.pdf) because the matrix is not invertible and
hence the clipping rectangle ends up infinite. Spot this case
here and return early.
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The first file of this bug (hang-66.pdf) hangs while stroking a
VERY long line segment; so long that 'used' is sufficinetly large
that:
used += dash_segment_len
doesn't result in a change in the value of used. The fix is
to clip strokes to the edge of the gel's clip area, meaning
that this should never occur.
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