Github user andruhon commented on the issue:
https://github.com/apache/wicket/pull/294
@svenmeier sure, it was the first thing I tried. Unfortunately it prevents
the w_captionText of the popup from working as a drag area, which I think is
undesired effect.
Potentially can be done as something like `e.target !== this &&
e.target.className.indexOf('w_captionText') == -1`, but it makes the
mouseDownHandler know about css classes of modal so I think the approach with
some general stopper class is more universal.
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