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If the current theme is not the mail theme, mailsystem_theme_theme_registry_alter() alters the theme registry by loading the mail theme in addition to the current theme.
So when the cache is cleared and theme_a is active, drupal first initializes theme_a and additionally theme_b (our mail theme). Due to the fact that drupal_alter caches the available functions, out hook_alter functions in out theme_b's template.php (or theme_b's base theme) don't get called, because these functions weren't loaded when theme_a got initialized.
This leaves theme_b (our mail theme) in an initialized, but broken state, as none of the themes alter hooks have been loaded.
|#65||mailsystem-theme-registry-2051135-65-do-not-test.patch||2.64 KB||Tom Verhaeghe|