Bug 128070 [implementation] Check usage of CustomSourceInformationControl
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/JavaEditor.java
if (fProjectionSupport != null) {
			fProjectionSupport.dispose();
			fProjectionSupport= null;
		}
		
		fMarkOccurrenceAnnotations= false;
		uninstallOccurrencesFinder();
		uninstallOverrideIndicator();
		uninstallSemanticHighlighting();
		if (fActivationListener != null) {
			PlatformUI.getWorkbench().removeWindowListener(fActivationListener);
			fActivationListener= null;
		}
		if (fEncodingSupport != null) {
			fEncodingSupport.dispose();
			fEncodingSupport= null;
		}
		if (fBracketMatcher != null) {
			fBracketMatcher.dispose();
			fBracketMatcher= null;
		}
		if (fSelectionHistory != null) {
			fSelectionHistory.dispose();
			fSelectionHistory= null;
		}
		if (fEditorSelectionChangedListener != null)  {
			fEditorSelectionChangedListener.uninstall(getSelectionProvider());
			fEditorSelectionChangedListener= null;
		}
		super.dispose();