
doc:   [
    DocGroup({"tag": "bullet"}, [
        DocGroup({"tag": "h3"}, [
            DocChars(" 5   p p7G"), DocGroup({"tag": "caret", "client": "a"}, []),
            DocChars(" ")
        ]),
        DocGroup({"tag": "h3"}, [
            DocChars("R"), DocGroup({"client": "b", "tag": "caret"}, []),
            DocChars("e 8"), DocGroup({"tag": "caret", "client": "e"}, []),
            DocChars("W 4M Q7 f JC4E6a")
        ])
    ]),
    DocGroup({"tag": "h2"}, [
        DocChars("7"), DocGroup({"client": "d", "tag": "caret"}, []),
        DocChars("l"), DocGroup({"tag": "caret", "client": "c"}, []),
        DocChars("c2H llo worl  What\'s up with you?")
    ])
]

a_del: [
    DelWithGroup([
        DelGroup([
            DelSkip(9), DelChars(1), DelGroup([]),
            DelSkip(1)
        ])
    ])
]
a_add: [
    AddWithGroup([
        AddGroup({"tag": "p"}, [
            AddChars("Q"), AddGroup({"client": "a", "tag": "caret"}, []),
            AddSkip(9), AddChars(" "), AddSkip(1)
        ])
    ])
]

b_del: [
    DelGroup([
        DelWithGroup([
            DelSkip(10), DelWithGroup([]),
            DelSkip(1)
        ]),
        DelWithGroup([
            DelChars(1), DelGroup([]),
            DelChars(1)
        ])
    ])
]
b_add: [
    AddWithGroup([
        AddSkip(10), AddWithGroup([]),
        AddSkip(1)
    ]),
    AddWithGroup([
        AddGroup({"tag": "caret", "client": "b"}, []),
        AddChars("Y")
    ])
]
