There are a handful of widgets that come with a standard WordPress installation, such as the RSS widget that displays data from any RSS feed in your sidebar (Design > Widgets > RSS).
I like to modify the RSS widget code to remove the RSS icon and remove the hyperlink from the title of the feed/widget. I do this by editing 'wp-includes/widgets.php'.
The problem is that every time I take a WordPress upgrade I have to go re-modify the widgets.php file.
Is there a way to prevent having to re-apply my changes to the RSS Widget in widgets.php every time I take an upgrade?