This fixes the issue that in the Dependencies section of the
Manifest-Editor if one called one of the following actions only the
'Plugin-Dependencies' of the latest version of all Bundles with the same
Bundle-SymbolicName was displayed:

For Plug-ins:
- "Show the plug-in dependency hierarchy"
- "Show dependent plug-ins and fragments"
For Fragments:
- "Find this fragment's host plug-in"