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
private List fTextConverters;
		private boolean fIgnoreTextConverters= false;
		private JavaCorrectionAssistant fCorrectionAssistant;
		
		public AdaptedSourceViewer(Composite parent, IVerticalRuler verticalRuler, IOverviewRuler overviewRuler, boolean showAnnotationsOverview, int styles, IPreferenceStore store) {
			super(parent, verticalRuler, overviewRuler, showAnnotationsOverview, styles, store);
		}
				
		public IContentAssistant getContentAssistant() {
			return fContentAssistant;
		}
		
		/*
		 * @see ITextOperationTarget#doOperation(int)
		 */
		public void doOperation(int operation) {
		
			if (getTextWidget() == null)
				return;
			
			switch (operation) {
				case CONTENTASSIST_PROPOSALS:
					long time= CODE_ASSIST_DEBUG ? System.currentTimeMillis() : 0;
					String msg= fContentAssistant.showPossibleCompletions();
					if (CODE_ASSIST_DEBUG) {
						long delta= System.currentTimeMillis() - time;
						System.err.println("Code Assist (total): " + delta); 
					}