The next change is to deprecate the support for overly minimal themes. Prior to WordPress 3.0 any theme which was using the relevant template tag but missing any of the following template files – header.php, footer.php, sidebar.php, comments.php, comments-popup.php – would effectively behave as if it has a parent theme defined as ‘default’ using the relevant files from the old default theme.
Now that we are moving to a new default theme we didn’t want to have to support this very old behaviour indefinitely or make it such that the files from the TwentyTen theme were used as they have a different visual layout and would like change peoples existing sites.
Going forward a WordPress theme using the relevant template tags is expected to contain all these files itself, or have them provided by a parent theme, and the theme compatibility files included in WordPress 3.0 will be removed in a future version.
If you are using a theme which is affected by this change then you just need to make sure that you have the default theme installed – it will not be in new installs but will be preserved on upgrades. Then add the following to the comment at the top of the style.css of your theme to make it such that the default theme is used as its parent theme:
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