* Observed bug: If an ArchWindow has two opening symbols (i.e. two sides
that can be opened), only one was printed in SVG.
* In Draft.getSVG.getPath, some edges got lost in the call of
Part.__sortEdges__. In contrast, Part.sortEdges does not skip edges. All
edges are retained.
* With this fix, both opening symbols are rendered in Draft.getSVG.
* While it works for my test case, I suppose, Draft.getSVG.getPath is
used in some other places as well. Thus, side effects must be checked
by experienced people.
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