
doc:   [
    DocGroup({"tag": "bullet"}, [
        DocGroup({"tag": "h2"}, [
            DocChars("G1"), DocGroup({"tag": "caret", "client": "a"}, []),
            DocChars("7 "), DocGroup({"client": "b", "tag": "caret"}, [])
        ]),
        DocGroup({"tag": "h1"}, [
            DocGroup({"client": "c", "tag": "caret"}, []),
            DocChars("867 6wErm!What\'s up with you?")
        ])
    ])
]

a_del: [
    DelWithGroup([
        DelGroup([
            DelChars(2), DelWithGroup([]),
            DelSkip(1), DelChars(1), DelGroup([])
        ])
    ])
]
a_add: [
    AddWithGroup([
        AddGroup({"tag": "h2"}, [
            AddGroup({"client": "b", "tag": "caret"}, []),
            AddChars("w "), AddWithGroup([]),
            AddSkip(1)
        ])
    ])
]

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