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/ui/text/JavaSourceViewerConfiguration.java
* @since 3.0
	 */
	public void setNewPreferenceStore(IPreferenceStore preferenceStore) {
		fNewPreferenceStore= preferenceStore;
		initializeScanners();
	}
	
	/**
	 * Creates and returns a new preference store which combines the preference
	 * stores from the text tools.
	 *
	 * @param tools Text tools
	 * @return Legacy preference store
	 * 
	 * @since 3.0
	 */
	private IPreferenceStore createNewPreferenceStore() {
		if (fJavaTextTools.getCorePreferenceStore() == null)
			return fJavaTextTools.getPreferenceStore();
		
		return new ChainedPreferenceStore(new IPreferenceStore[] { fJavaTextTools.getPreferenceStore(), new PreferencesAdapter(fJavaTextTools.getCorePreferenceStore()) });
	}
	/**
	 * Initializes the scanners.
	 * 
	 * @since 3.0 
	 */
	private void initializeScanners() {
		fCodeScanner= new JavaCodeScanner(getColorManager(), getNewPreferenceStore());
		fMultilineCommentScanner= new JavaCommentScanner(getColorManager(), getNewPreferenceStore(), IJavaColorConstants.JAVA_MULTI_LINE_COMMENT);