Can't render visible private branch on invisible private project

[Colin Watson]

If a private branch is shared with you but its containing project isn't, then you can't render Branch:+index or run bzr operations on it. Branch:+index fails with a traceback ending in:

    Module lp.code.browser.branch, line 417, in page_title
    return self.context.bzr_identity
    Module lp.services.propertycache, line 115, in __get__
    value = self.populate(instance)
    Module lp.code.browser.decorations, line 51, in bzr_identity
    return super(DecoratedBranch, self).bzr_identity
    Module lp.code.interfaces.branch, line 1561, in bzr_identity
    return config.codehosting.bzr_lp_prefix + self.shortened_path
    Module lp.code.interfaces.branch, line 1556, in shortened_path
    return self.getBranchIdentities()[0][0]
    Module lp.code.interfaces.branch, line 1572, in getBranchIdentities
    for link in self.getBranchLinks()]
    Module lp.code.interfaces.branch, line 1587, in getBranchLinks
    if series.product.development_focus == series:

Unauthorized: (<Product at 0x7fb19dc59d50>, 'development_focus', 'launchpad.View')

bzr operations fail with "<ProtocolError for xmlrpc.lp.internal:8097/codehosting: 401 Unauthorized>"; I wasn't able to capture more details than that.

getBranchLinks is trying to fetch attributes that require launchpad.View rather than launchpad.LimitedView. As far as I can tell, the user ought to have LimitedView in this situation in order to be able to traverse to the branch.