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Fix header rerender bug which occurs when a table has two header rows… #29921

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Fix header rerender bug which occurs when a table has two header rows… #29921

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5 changes: 4 additions & 1 deletion src/cdk/table/table.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -1084,7 +1084,10 @@ export class CdkTable<T>
* re-render that section.
*/
private _renderUpdatedColumns(): boolean {
const columnsDiffReducer = (acc: boolean, def: BaseRowDef) => acc || !!def.getColumnsDiff();
const columnsDiffReducer = (acc: boolean, def: BaseRowDef) => {
const diff = !!def.getColumnsDiff();
return acc || diff;
}

// Force re-render data rows if the list of column definitions have changed.
const dataColumnsChanged = this._rowDefs.reduce(columnsDiffReducer, false);
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