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
else
						stopTabConversion();
					return;
				}
				
				if (PreferenceConstants.EDITOR_SMART_TAB.equals(p)) {
					if (getPreferenceStore().getBoolean(PreferenceConstants.EDITOR_SMART_TAB)) {
						setActionActivationCode("IndentOnTab", '\t', -1, SWT.NONE); 
					} else {
						removeActionActivationCode("IndentOnTab"); 
					}
				}
				IContentAssistant c= asv.getContentAssistant();
				if (c instanceof ContentAssistant)
					ContentAssistPreference.changeConfiguration((ContentAssistant) c, getPreferenceStore(), event);
				if (CODE_FORMATTER_TAB_SIZE.equals(p)) {
					asv.updateIndentationPrefixes();
					if (fTabConverter != null)
						fTabConverter.setNumberOfSpacesPerTab(getTabSize());
				}
			}
				
		} finally {
			super.handlePreferenceStoreChanged(event);
		}
	}
	/*
	 * @see org.eclipse.jdt.internal.ui.javaeditor.JavaEditor#createJavaSourceViewer(org.eclipse.swt.widgets.Composite, org.eclipse.jface.text.source.IVerticalRuler, org.eclipse.jface.text.source.IOverviewRuler, boolean, int)
	 */
	protected ISourceViewer createJavaSourceViewer(Composite parent, IVerticalRuler verticalRuler, IOverviewRuler overviewRuler, boolean isOverviewRulerVisible, int styles, IPreferenceStore store) {