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a/upmpd/ohvolume.cxx b/upmpd/ohvolume.cxx
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    } else {
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    } else {
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        changed = diffmaps(m_state, state);
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        changed = diffmaps(m_state, state);
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    }
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    }
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    m_state = state;
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    m_state = state;
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    for (auto& member : changed) {
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    for (auto it = changed.begin(); it != changed.end(); it++) {
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        names.push_back(member.first);
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        names.push_back(it->first);
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        values.push_back(member.second);
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        values.push_back(it->second);
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    }
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    }
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    return true;
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    return true;
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}
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}
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