Bug 53010 Editor preferences do not take effect on open editors
I-20040224 Go to the Java > Editor > Syntax preference page. Change the keyword color to red. Press Ok. At this point, we use to see the preview update. Not on this build (problem #1). Press Ok, and close the pref dialog. The java editor that was already open did not update. I had to close it and reopen it for the colors to take effect (problem #2)
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/JavaEditor.java
} finally {
				fDocument.removeDocumentListener(this);
			}
			return Status.OK_STATUS;
		}
		/*
		 * @see org.eclipse.jface.text.IDocumentListener#documentAboutToBeChanged(org.eclipse.jface.text.DocumentEvent)
		 */
		public void documentAboutToBeChanged(DocumentEvent event) {
			fCancelled= true;
		}
		/*
		 * @see org.eclipse.jface.text.IDocumentListener#documentChanged(org.eclipse.jface.text.DocumentEvent)
		 */
		public void documentChanged(DocumentEvent event) {
		}
	}	
	
	/**
	 * Updates the occurrences annotations based
	 * on the current selection.
	 *
	 * @since 3.0
	 */
	protected void updateOccurrenceAnnotations(ITextSelection selection, CompilationUnit astRoot) {
		if (!fMarkOccurrenceAnnotations)
			return;
		
		if (astRoot == null || selection == null)
			return;