Merge branch 'mf/submodule-summary-with-correct-repository'

"git diff/show" on a change that involves a submodule used to read the information on commits in the submodule from a wrong repository and gave a wrong information when the commit-graph is involved. * mf/submodule-summary-with-correct-repository: submodule: use submodule repository when preparing summary revision: use repository from rev_info when parsing commits