fix fetchOnPull behavior for Sync

extensions/git/src/git.ts

@@ -1513,9 +1513,11 @@ export class Repository {
 		await this.run(args);
 	}
 
-	async fetch(options: { remote?: string, ref?: string, all?: boolean, prune?: boolean, depth?: number, silent?: boolean } = {}): Promise<void> {
+	async fetch(options: { remote?: string, ref?: string, all?: boolean, prune?: boolean, depth?: number, silent?: boolean, readonly cancellationToken?: CancellationToken } = {}): Promise<void> {
 		const args = ['fetch'];
-		const spawnOptions: SpawnOptions = {};
+		const spawnOptions: SpawnOptions = {
+			cancellationToken: options.cancellationToken,
+		};
 
 		if (options.remote) {
 			args.push(options.remote);

extensions/git/src/repository.ts

@@ -1225,9 +1225,16 @@ export class Repository implements Disposable {
 				const tags = config.get<boolean>('pullTags');
 				const supportCancellation = config.get<boolean>('supportCancellation');
 
-				const fn = fetchOnPull
-					? async (cancellationToken?: CancellationToken) => await this.repository.pull(rebase, undefined, undefined, { tags, cancellationToken })
-					: async (cancellationToken?: CancellationToken) => await this.repository.pull(rebase, remoteName, pullBranch, { tags, cancellationToken });
+				const fn = async (cancellationToken?: CancellationToken) => {
+
+					// When fetchOnPull is enabled, fetch all branches when pulling
+					if (fetchOnPull) {
+						await this.repository.fetch({ all: true, cancellationToken });
+					}
+
+					await this.repository.pull(rebase, remoteName, pullBranch, { tags, cancellationToken });
+				};
+
 
 				if (supportCancellation) {
 					const opts: ProgressOptions = {