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
public void restore() {
			/* https://bugs.eclipse.org/bugs/show_bug.cgi?id=52257
			 * This method may be called inside an asynchronous call posted
			 * to the UI thread, so protect against intermediate disposal
			 * of the editor.
			 */
			if (getSourceViewer() == null)
				return;
			
			try {
				
				int startOffset, endOffset;
				int revealStartOffset, revealEndOffset; 
				if (showsHighlightRangeOnly()) {
					IJavaElement newStartElement= fStartOffset.getElement();
					startOffset= fStartOffset.getRememberedOffset(newStartElement);
					revealStartOffset= fStartOffset.getRevealOffset(newStartElement, startOffset);
					if (revealStartOffset == -1)
						startOffset= -1;
					
					IJavaElement newEndElement= fEndOffset.getElement();
					endOffset= fEndOffset.getRememberedOffset(newEndElement);
					revealEndOffset= fEndOffset.getRevealOffset(newEndElement, endOffset);
					if (revealEndOffset == -1)
						endOffset= -1;
				} else {
					startOffset= fStartOffset.getOffset();
					revealStartOffset= startOffset;
					endOffset= fEndOffset.getOffset();
					revealEndOffset= endOffset;