Fix potential problem with null path segments leaving dots.

When stroking paths if we meet segments of 0 length, we can't
determine a direction, thus start/end caps are omitted. Line
widths are irrelevant, and we thus render nothing.

(Note that moves on their own do NOT count as a line segment).

The exception to this is where we are using round caps, whereupon
whatever direction the path is taken to have, the appearance will
be the same - and this we render the segment as a dot.

We have code in the renderer already to do this, but it looks to
me like it could be fooled into leaving a dot by us first doing
a move, a lineto the same point, and then a lineto to somewhere
else. The current code sets the 'dot' value to 1 when it detects
the degenerate line, and doesn't reset when it meets a
non-degenerate line later.

Accordingly I've changed the code here to account for such a
circumstance.

This produces no diffs in the cluster testing, but seems more
correct to me.

0 files changed, 0 insertions, 0 deletions