From 561f6e23cba8b4da840128cd38c528a3f4506e77 Mon Sep 17 00:00:00 2001
From: Andrew Seguin <andrewseguin@google.com>
Date: Wed, 13 Nov 2024 13:30:47 -0700
Subject: [PATCH 1/2] fix(cdk/table): run differ for all columns

---
 src/cdk/table/table.ts | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/cdk/table/table.ts b/src/cdk/table/table.ts
index 7d0b5141a200..d25529219bf3 100644
--- a/src/cdk/table/table.ts
+++ b/src/cdk/table/table.ts
@@ -1085,7 +1085,10 @@ 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);

From bd700d29d3dcdca5ffc486a8a18cf8861f9dca28 Mon Sep 17 00:00:00 2001
From: Andrew Seguin <andrewjs@google.com>
Date: Thu, 14 Nov 2024 10:23:40 -0700
Subject: [PATCH 2/2] fix(cdk/table): include comment

---
 src/cdk/table/table.ts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/cdk/table/table.ts b/src/cdk/table/table.ts
index d25529219bf3..56c416ab560d 100644
--- a/src/cdk/table/table.ts
+++ b/src/cdk/table/table.ts
@@ -1086,6 +1086,8 @@ export class CdkTable<T>
    */
   private _renderUpdatedColumns(): boolean {
     const columnsDiffReducer = (acc: boolean, def: BaseRowDef) => {
+      // The differ should be run for every column, even if `acc` is already
+      // true (see #29922)
       const diff = !!def.getColumnsDiff();
       return acc || diff;
     };