Bug 128070 [implementation] Check usage of CustomSourceInformationControl
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/JavaEditor.java
fPage= null;
			}
			if (fFoldingRunner == this)
				fFoldingRunner= null;
		}
		/*
		 * @see org.eclipse.ui.IPartListener2#partVisible(org.eclipse.ui.IWorkbenchPartReference)
		 */
		public void partVisible(IWorkbenchPartReference partRef) {
			if (JavaEditor.this.equals(partRef.getPart(false))) {
				cancel();
				toggleFolding();
			}
		}
		/*
		 * @see org.eclipse.ui.IPartListener2#partClosed(org.eclipse.ui.IWorkbenchPartReference)
		 */
		public void partClosed(IWorkbenchPartReference partRef) {
			if (JavaEditor.this.equals(partRef.getPart(false))) {
				cancel();
			}
		}
		public void partActivated(IWorkbenchPartReference partRef) {}
		public void partBroughtToTop(IWorkbenchPartReference partRef) {}
		public void partDeactivated(IWorkbenchPartReference partRef) {}
		public void partOpened(IWorkbenchPartReference partRef) {}
		public void partHidden(IWorkbenchPartReference partRef) {}
		public void partInputChanged(IWorkbenchPartReference partRef) {}
	}