
doc:   [
    DocGroup({"tag": "bullet"}, [
        DocGroup({"tag": "h3"}, [
            DocGroup({"client": "a", "tag": "caret"}, []),
            DocChars("  ")
        ]),
        DocGroup({"tag": "p"}, [
            DocGroup({"client": "b", "tag": "caret"}, []),
            DocChars("lo wlWhat\'s up with you?")
        ])
    ])
]

a_del: [
    DelWithGroup([
        DelGroup([
            DelGroup([]),
            DelChars(1), DelSkip(1)
        ])
    ])
]
a_add: [
    AddWithGroup([
        AddGroup({"tag": "h3"}, [
            AddChars("A"), AddGroup({"client": "a", "tag": "caret"}, [])
        ]),
        AddGroup({"tag": "p"}, [
            AddSkip(1)
        ])
    ])
]

b_del: [
    DelGroup([
        DelWithGroup([
            DelWithGroup([]),
            DelSkip(2)
        ]),
        DelWithGroup([
            DelGroup([]),
            DelChars(1)
        ])
    ])
]
b_add: [
    AddWithGroup([
        AddWithGroup([]),
        AddSkip(2)
    ]),
    AddWithGroup([
        AddChars(" "), AddGroup({"client": "b", "tag": "caret"}, [])
    ])
]
