Date: 2010-01-06 22:09:00 +0000 (Wed, 06 Jan 2010)
Replace the given widget, if the (up to now forbidden) place parameter
GWT_BY_WIDGETPTR is used in a link call.
This is useful for swapping out entries that have changed without first
having to find out where exactly they are attached which can be tricky,
e.g. for grids.
Note that this unlinks the widget and thus the given widget needs to be
destroyed properly unless it should be reused.
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