From 960d269ca2037464d74a10613a831733448cf673 Mon Sep 17 00:00:00 2001
From: Johannes Millan <johannes.millan@gmail.com>
Date: Tue, 21 Apr 2026 16:55:12 +0200
Subject: [PATCH] fix(schedule): deduplicate @for track key for split event
 segments

Split projections (RepeatProjectionSplit, SplitTaskContinued, and related
types) share the underlying task/repeat-cfg id across their visual segments,
producing NG0955 duplicate-key warnings in the week-view grid. Combine id,
plannedForDay, and startHours so each segment has a unique track key and
Angular can reconcile views cleanly.
---
 .../schedule/schedule-week/schedule-week.component.html    | 4 ++--
 .../schedule/schedule-week/schedule-week.component.ts      | 7 +++++++
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/app/features/schedule/schedule-week/schedule-week.component.html b/src/app/features/schedule/schedule-week/schedule-week.component.html
index 591f8b3ee4..98f99de9f7 100644
--- a/src/app/features/schedule/schedule-week/schedule-week.component.html
+++ b/src/app/features/schedule/schedule-week/schedule-week.component.html
@@ -93,7 +93,7 @@
   }
 
   <!-- Events -->
-  @for (ev of safeEvents(); track ev.id) {
+  @for (ev of safeEvents(); track trackEventKey(ev)) {
     @if (isDraggableSE(ev)) {
       <schedule-event
         class="draggable"
@@ -127,7 +127,7 @@
           <mat-icon>hourglass_disabled</mat-icon>
           {{ beyondBudgetDay.length }}
         </div>
-        @for (ev of beyondBudgetDay; track ev.id) {
+        @for (ev of beyondBudgetDay; track trackEventKey(ev)) {
           @if (isDraggableSE(ev)) {
             <schedule-event
               [event]="ev"
diff --git a/src/app/features/schedule/schedule-week/schedule-week.component.ts b/src/app/features/schedule/schedule-week/schedule-week.component.ts
index 156cc537aa..991b260cd2 100644
--- a/src/app/features/schedule/schedule-week/schedule-week.component.ts
+++ b/src/app/features/schedule/schedule-week/schedule-week.component.ts
@@ -115,6 +115,13 @@ export class ScheduleWeekComponent implements OnInit, AfterViewInit, OnDestroy {
   safeEvents = computed(() => this.events() || []);
   safeBeyondBudget = computed(() => this.beyondBudget() || []);
 
+  // Split projections (RepeatProjectionSplit, SplitTaskContinued, …) share the
+  // task/repeat-cfg id across segments. Combine day + start hour so each visual
+  // segment has a unique @for track key and Angular can reconcile them.
+  trackEventKey(ev: ScheduleEvent): string {
+    return `${ev.id}_${ev.plannedForDay ?? ''}_${ev.startHours}`;
+  }
+
   newTaskPlaceholder = signal<{
     style: string;
     time: string;