git-merge.dot

digraph {
    node [shape = "box", style = "filled, rounded"]

    subgraph clustermain {
        label = "main"

        node [color = limegreen]

        A[label = "A"]
        B[label = "B"]
        C[label = "C"]
        M[label = "M"]

        M -> C -> B -> A
    }

    subgraph clusterfeature {
        label = "topic/feature"

        node [color = orchid]

        F1[label = "F1"]
        F2[label = "F2"]

        F2 -> F1
    }

    F1 -> A
    M -> F2 [constraint = false]
}