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@@ -166,8 +166,8 @@ export default {
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const { rowKey, treeData } = this.states;
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const id = getRowIdentity(row, rowKey);
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const data = id && treeData[id];
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- const oldExpanded = treeData[id].expanded;
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- if (id && data && 'expanded' in data) {
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+ if (id && data && ('expanded' in data)) {
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+ const oldExpanded = data.expanded;
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expanded = typeof expanded === 'undefined' ? !data.expanded : expanded;
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treeData[id].expanded = expanded;
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if (oldExpanded !== expanded) {
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