Bug 90528 Editor icon does not show problem decoration for second instance
3.1 M6 - open a .java file that has errors or warnings - the editor tab icon has the problem decoration - Window > New Window - open the same file in the new window - the editor tab icon is missing the problem decoration
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/CompilationUnitEditor.java
fTabConverter= null;
		}
	}
	
	private boolean isTabConversionEnabled() {
		IPreferenceStore store= getPreferenceStore();
		return JavaCore.SPACE.equals(store.getString(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) {