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
* @see org.eclipse.jface.text.link.ILinkedModeListener#left(org.eclipse.jface.text.link.LinkedModeModel, int)
		 */
		public void left(LinkedModeModel environment, int flags) {
			
			final BracketLevel level= (BracketLevel) fBracketLevelStack.pop();
			if (flags != ILinkedModeListener.EXTERNAL_MODIFICATION)
				return;
			
			final ISourceViewer sourceViewer= getSourceViewer();
			final IDocument document= sourceViewer.getDocument();
			if (document instanceof IDocumentExtension) {
				IDocumentExtension extension= (IDocumentExtension) document;
				extension.registerPostNotificationReplace(null, new IDocumentExtension.IReplace() {
					
					public void perform(IDocument d, IDocumentListener owner) {
						if ((level.fFirstPosition.isDeleted || level.fFirstPosition.length == 0) 
								&& !level.fSecondPosition.isDeleted 
								&& level.fSecondPosition.offset == level.fFirstPosition.offset)
						{
							try {
								document.replace(level.fSecondPosition.offset, 
												 level.fSecondPosition.length, 
												 null);
							} catch (BadLocationException e) {
								JavaPlugin.log(e);
							}
						}
						
						if (fBracketLevelStack.size() == 0) {
							document.removePositionUpdater(fUpdater);