If a tree of components has become children of the othe component, this method called only against the root one. For example, if component A has a child B and A becomes a child of component C, then aferComponentAttached(C, A, null) is called.
Note: exception thrown by this method is ignored (but logged). @param prevparent the previous parent. If it is the same asparent, comp is moved in the same parent.
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