Function package_catalog 

pub fn package_catalog<'a>(
    installed: &'a [PluginInfo],
    registry: Option<&'a PluginRegistryIndex>,
) -> Vec<PluginCatalogEntry<'a>>

Merge installed packages with an optional registry index.

installed is the admitted view returned by PluginHost::list_plugins. The result has one row per package name and is sorted by name. Registry indexes may contain multiple versions of a package; resolved_entries selects the same entry an unpinned install would use.