Disposes of this view. Clients should not call this method; it is called
by the Eclipse infrastructure.
This is the last method called on the view. At this point the part
controls (if they were ever created) have been disposed as part of an SWT
composite. There is no guarantee that createPartControl() has been
called, so the part controls may never have been created.
Within this method a part may release any resources, fonts, images,
etc. held by this part. It is also very important to deregister all
listeners from the workbench.
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