Build 4584
SVN-
demote wall check "corruptions" introduced in r4569 to level 2.
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The winding of a loop -- with clockdir() -- is determined by examining the two line segments spanned between the points following a leftmost point of the loop. If the loop contains a leftmost point that belongs to the "right" side (as can happen with sliding door constructions), there's a chance that an outer loop is misclassified.