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fix(cdk/tree): set index in context #31709

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Aug 18, 2025
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1 change: 1 addition & 0 deletions src/cdk/tree/tree.ts
Original file line number Diff line number Diff line change
Expand Up @@ -603,6 +603,7 @@ export class CdkTree<T, K = T>

// Node context that will be provided to created embedded view
const context = new CdkTreeNodeOutletContext<T>(nodeData);
context.index = index;

parentData ??= this._parents.get(key) ?? undefined;
// If the tree is flat tree, then use the `getLevel` function in flat tree control
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