Disabled modules list shows not installed modules

The page at admin/reports/enabled_modules/disabled claims to only show modules if they have previously been enabled but now disabled.

In fact, it shows all modules that are not enabled, whether or not they have ever been so.

This is because the status field alone cannot determine if module has previously been enabled. For this, the schema field has to be checked as well. Modules that have NEVER been enabled have a schema version of '-1'.

This is how core does it:

$disabled_modules = db_query("SELECT name, filename, info FROM {system} WHERE type = 'module' AND status = 0 AND schema_version > %d ORDER BY name", SCHEMA_UNINSTALLED);

Patch to follow.