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
* Return offset recomputed from stored visual properties.  
		 * 
		 * @return Offset in the document
		 */
		public int getOffset() {
			IJavaElement newElement= getElement();
			
			int offset= getRememberedOffset(newElement);
			
			if (offset != -1 && !containsOffset(newElement, offset) && (offset == 0 || !containsOffset(newElement, offset - 1)))
				return -1;
			
			return offset;
		}
		
		/**
		 * Return offset recomputed from stored visual properties.  
		 * 
		 * @param newElement Enclosing element
		 * @return Offset in the document
		 */
		public int getRememberedOffset(IJavaElement newElement) {
			try {
				if (newElement == null)
					return -1;
				
				IDocument document= getSourceViewer().getDocument();
				int newElementLine= -1;
				if (newElement instanceof IMember) {
					ISourceRange range= ((IMember) newElement).getNameRange();