Added a __deepcopy__() method to the Widget class in order to avoid a number of easy-to-trigger problems when copying Widget subclasses. Subclasses which are intended to have extra mutable fields should override this method. Refs #5505.
Added a __deepcopy__() method to the Widget class in order to avoid a number of easy-to-trigger problems when copying Widget subclasses. Subclasses which are intended to have extra mutable fields should override this method. Refs #5505.


git-svn-id: 554f83ef17aa7291f84efa897c1acfc5d0035373@6450 bcc190cf-cafb-0310-a4f2-bffc1f526a37

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