Dynamic Highlight bug

This bug has been added by François Lauzon at
http://www.opencascade.org/forumorg/bug.php?bug_id=108&f=8 .

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There is a bug in the dynamic highlighting with some models. In the model I
attached, when you move the mouse over the side surface (f2.iges), the side
surface should be highlighted, but instead it's the bottom surface (f1.iges)
that is highlight (see BadHighlight.jpg). The bottom surface will get highlight
until it is no longer visible under the mouse, then the side surface will get
highlighted (see highlight.jpg). What is strange is that it doesn't do that
will all the surface (see highlightok.jpg).

This is really annoying, since in some situation you can't select an object you
should be able to select. This problem occur with a lot of different files that
we have.

I have included the 3 jpg files and iges files.

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