Merge branch 'ps/shift-root-in-graph' into next

'git log --graph' has been modified to visually distinguish parentless 'root' commits (and commits that become roots due to history simplification) by indenting them, preventing them from appearing falsely related to unrelated commits rendered immediately above them. * ps/shift-root-in-graph: graph: add --[no-]graph-indent and log.graphIndent graph: move config reading into graph_read_config() graph: wrap cascading commits after 4 columns graph: indent visual root in graph graph: add a 2 commit buffer for lookahead revision: add next_commit_to_show() lib-log-graph: move check_graph function