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Provides JFace support for long-running operations.

Package Specification
Long-running operations must be dealt with specially in order to keep the
UI helpful and responsive. Typically this involves temporarily disabling
most controls and displaying a busy cursor and progress indicator; while
the operation is in progress, the only requests that will be accepted will
be ones to cancel the operation.
The IRunnableWithProgress interface should be implemented by
any class whose instances are intended to be executed as long-running operations.
These objects can then be run in any runnable context (IRunnableContext),
including such standard JFace UI components as application windows (ApplicationWindow),
wizard dialogs (WizardDialog), and progress monitor dialogs (ProgressMonitorDialog).
The utility class ModalContext defines the basic mechanism and
UI event loop for modal operations.