
doc:   [
    DocGroup({"tag": "h2"}, [
        DocChars("Hello wo"), DocGroup({"client": "a", "tag": "caret"}, [])
    ]),
    DocGroup({"tag": "p"}, [
        DocChars("4hat\'s up with you?")
    ])
]

a_del: [
    DelGroup([
        DelChars(4), DelSkip(3), DelChars(1), DelGroup([])
    ]),
    DelGroup([
        DelSkip(19)
    ])
]
a_add: [
    AddGroup({"tag": "bullet"}, [
        AddGroup({"tag": "h2"}, [
            AddGroup({"client": "a", "tag": "caret"}, [])
        ]),
        AddGroup({"tag": "h2"}, [
            AddGroup({"tag": "caret", "client": "b"}, []),
            AddChars("1"), AddSkip(3), AddChars("o")
        ])
    ]),
    AddGroup({"tag": "bullet"}, [
        AddGroup({"tag": "h2"}, [
            AddChars("L"), AddSkip(19)
        ])
    ])
]

b_del: [
    DelGroup([
        DelChars(2), DelSkip(5), DelChars(1), DelWithGroup([])
    ]),
    DelGroup([
        DelSkip(19)
    ])
]
b_add: [
    AddGroup({"tag": "bullet"}, [
        AddGroup({"tag": "h2"}, [
            AddGroup({"tag": "caret", "client": "c"}, []),
            AddChars("60"), AddSkip(5), AddWithGroup([]),
            AddChars("Q4"), AddSkip(19)
        ])
    ])
]
