Bug 129309 [Workbench] allow 'Copy' on the status line
bundles/org.eclipse.jface/src/org/eclipse/jface/action/StatusLine.java
/**
	 * Sets the cancel status. This method is usually called with the argument
	 * false if a client wants to abort a cancel action.
	 */
	public void setCanceled(boolean b) {
		fIsCanceled = b;
		if (fCancelButton != null) {
			fCancelButton.setEnabled(!b);
		}
	}
	/**
	 * Controls whether the ProgressIndication provides UI for canceling a long
	 * running operation. If the ProgressIndication is currently visible calling
	 * this method may have a direct effect on the layout because it will make a
	 * cancel button visible.
	 * 
	 * @param enabled
	 *            <code>true</true> if cancel should be enabled
	 */
	public void setCancelEnabled(boolean enabled) {
		fCancelEnabled = enabled;
		if (fProgressIsVisible && !fCancelButtonIsVisible && enabled) {
			showButton();
			layout();
		}
		if (fCancelButton != null && !fCancelButton.isDisposed()) {
			fCancelButton.setEnabled(enabled);
		}
	}
	/**