if you undo a cropping made with the imagecropper-bundle, any interaction with the multiwidget leads to a crash
Description
Description
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only clicking in one of the 2D-views lead to the crash, other interaction is possible. When clicking inside a 2D-view, the NodeDeleted callback function is executed.
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[SVN revision 22955]
FIX (#3724): added a destructor for opExchangeNodes (which is a mitk::Operation). when called, it removes the observers from m_Node, m_OldData and m_NewData