Bug 54468 Remove non-default-encoding-alert from CompilationUnitEditor
no longer necessary with new encoding support.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/CompilationUnitEditor.java
fTabConverter= null;
		}
	}
	
	private boolean isTabConversionEnabled() {
		IPreferenceStore store= getNewPreferenceStore();
		return store.getBoolean(SPACES_FOR_TABS);
	}
	
	public void dispose() {
		ISourceViewer sourceViewer= getSourceViewer();
		if (sourceViewer instanceof ITextViewerExtension)
			((ITextViewerExtension) sourceViewer).removeVerifyKeyListener(fBracketInserter);
		if (fJavaEditorErrorTickUpdater != null) {
			fJavaEditorErrorTickUpdater.dispose();
			fJavaEditorErrorTickUpdater= null;
		}
		
		if (fActionGroups != null) {
			fActionGroups.dispose();
			fActionGroups= null;
		}
			
		super.dispose();
	}
	
	/*
	 * @see AbstractTextEditor#createPartControl(Composite)
	 */
	public void createPartControl(Composite parent) {