I found a little coding standard bug in dashboard.js: the line indent is wrong in:
/**
* Implements Drupal.behaviors for the Dashboard module.
*/
Drupal.behaviors.dashboard = {
attach: function (context, settings) {
$('#dashboard', context).once(function () {
$(this).prepend('<div class="customize clearfix"><ul class="action-links"><li><a href="#">' + Drupal.t('Customize dashboard') + '</a></li></ul><div class="canvas"></div></div>');
$('.customize .action-links a', this).click(Drupal.behaviors.dashboard.enterCustomizeMode);
});