Merge pull request #105341 from microsoft/sandy081/fix104834

Fix #104834

src/vs/platform/userDataSync/common/abstractSynchronizer.ts

@@ -324,6 +324,7 @@ export abstract class AbstractSynchroniser extends Disposable {
 						this.logService.info(`${this.syncResourceLogLabel}: Failed to synchronize ${this.syncResourceLogLabel} as there is a new local version available. Synchronizing again...`);
 						return this.performSync(remoteUserData, lastSyncUserData, apply);
 
+					case UserDataSyncErrorCode.Conflict:
 					case UserDataSyncErrorCode.PreconditionFailed:
 						// Rejected as there is a new remote version. Syncing again...
 						this.logService.info(`${this.syncResourceLogLabel}: Failed to synchronize as there is a new remote version available. Synchronizing again...`);

src/vs/platform/userDataSync/common/userDataSync.ts

@@ -208,6 +208,7 @@ export const HEADER_EXECUTION_ID = 'X-Execution-Id';
 export enum UserDataSyncErrorCode {
 	// Client Errors (>= 400 )
 	Unauthorized = 'Unauthorized', /* 401 */
+	Conflict = 'Conflict', /* 409 */
 	Gone = 'Gone', /* 410 */
 	PreconditionFailed = 'PreconditionFailed', /* 412 */
 	TooLarge = 'TooLarge', /* 413 */

src/vs/platform/userDataSync/common/userDataSyncStoreService.ts

@@ -395,6 +395,10 @@ export class UserDataSyncStoreService extends Disposable implements IUserDataSyn
 
 		this._onTokenSucceed.fire();
 
+		if (context.res.statusCode === 409) {
+			throw new UserDataSyncStoreError(`${options.type} request '${options.url?.toString()}' failed because of Conflict (409). There is new data exists for this resource. Make the request again with latest data.`, UserDataSyncErrorCode.Conflict, operationId);
+		}
+
 		if (context.res.statusCode === 410) {
 			throw new UserDataSyncStoreError(`${options.type} request '${options.url?.toString()}' failed because the requested resource is not longer available (410).`, UserDataSyncErrorCode.Gone, operationId);
 		}