Fail loudly if workspace state out of sync

apps/desktop/src/lib/vbranches/upstreamIntegrationService.ts

@@ -1,6 +1,5 @@
 import { invoke } from '$lib/backend/ipc';
 import { VirtualBranchService } from '$lib/vbranches/virtualBranch';
-import { isDefined } from '@gitbutler/ui/utils/typeguards';
 import { derived, readable, type Readable } from 'svelte/store';
 import type { Project } from '$lib/backend/projects';
 import type { VirtualBranch } from '$lib/vbranches/types';
@@ -135,18 +134,20 @@ export class UpstreamIntegrationService {
 
 				return {
 					type: 'updatesRequired',
-					subject: branchStatuses.subject
-						.map((status) => {
-							const stack = branches.find((appliedBranch) => appliedBranch.id === status[0]);
-
-							if (!stack) return;
-
-							return {
-								stack,
-								status: status[1]
-							};
-						})
-						.filter(isDefined)
+					subject: branchStatuses.subject.map((status) => {
+						const stack = branches.find((appliedBranch) => appliedBranch.id === status[0]);
+
+						if (!stack) {
+							throw new Error(
+								`Could not find stack with id ${status[0]}. Please report this issue and try restarting the app and trying again.`
+							);
+						}
+
+						return {
+							stack,
+							status: status[1]
+						};
+					})
 				};
 			}
 		);