
doc:   [
    DocGroup({"tag": "h1"}, [
        DocGroup({"client": "a", "tag": "caret"}, []),
        DocGroup({"client": "c", "tag": "caret"}, []),
        DocChars(" ello world!W"), DocGroup({"client": "b", "tag": "caret"}, []),
        DocChars("hat\'s up with you?")
    ])
]

a_del: [
    DelGroup([
        DelGroup([]),
        DelSkip(33)
    ])
]
a_add: [
    AddGroup({"tag": "h2"}, []),
    AddGroup({"tag": "bullet"}, [
        AddGroup({"tag": "h1"}, [
            AddGroup({"tag": "caret", "client": "a"}, []),
            AddChars("  "), AddSkip(33)
        ])
    ])
]

b_del: [
    DelGroup([
        DelWithGroup([]),
        DelWithGroup([]),
        DelSkip(1), DelChars(1), DelSkip(7), DelChars(2), DelSkip(1), DelChars(1), DelGroup([]),
        DelChars(1), DelSkip(17)
    ])
]
b_add: [
    AddGroup({"tag": "bullet"}, [
        AddGroup({"tag": "p"}, [
            AddWithGroup([]),
            AddWithGroup([]),
            AddSkip(1), AddChars("R"), AddGroup({"client": "b", "tag": "caret"}, []),
            AddChars(" "), AddSkip(7), AddChars("b "), AddSkip(18)
        ])
    ])
]
