Use git setting to fetch before checkout in checkoutExistingPullRequestBranch

package.json

@@ -347,6 +347,11 @@
 					"description": "%githubPullRequests.setAutoMerge.description%",
 					"default": false
 				},
+				"githubPullRequests.pullPullRequestBranchBeforeCheckout": {
+					"type": "boolean",
+					"description": "%githubPullRequests.pullPullRequestBranchBeforeCheckout.description%",
+					"default": true
+				},
 				"githubIssues.ignoreMilestones": {
 					"type": "array",
 					"default": [],

package.nls.json

@@ -63,6 +63,7 @@
 	"githubPullRequests.defaultCommentType.single": "Submits the comment as a single comment that will be immediately visible to other users",
 	"githubPullRequests.defaultCommentType.review": "Submits the comment as a review comment that will be visible to other users once the review is submitted",
 	"githubPullRequests.setAutoMerge.description": "Checks the \"Auto-merge\" checkbox in the \"Create Pull Request\" view.",
+	"githubPullRequests.pullPullRequestBranchBeforeCheckout.description": "Pulls pull request before checkout",
 	"githubIssues.ignoreMilestones.description": "An array of milestones titles to never show issues from.",
 	"githubIssues.createIssueTriggers.description": "Strings that will cause the 'Create issue from comment' code action to show.",
 	"githubIssues.createIssueTriggers.items": "String that enables the 'Create issue from comment' code action. Should not contain whitespace.",

src/common/settingKeys.ts

@@ -27,6 +27,7 @@ export const DEFAULT_DELETION_METHOD = 'defaultDeletionMethod';
 export const SELECT_LOCAL_BRANCH = 'selectLocalBranch';
 export const SELECT_REMOTE = 'selectRemote';
 export const REMOTES = 'remotes';
+export const PULL_PR_BRANCH_BEFORE_CHECKOUT = 'pullPullRequestBranchBeforeCheckout';
 
 export const ISSUES_SETTINGS_NAMESPACE = 'githubIssues';
 export const ASSIGN_WHEN_WORKING = 'assignWhenWorking';

src/github/pullRequestGitHelper.ts

@@ -12,6 +12,7 @@ import { GitErrorCodes } from '../api/api1';
 import Logger from '../common/logger';
 import { Protocol } from '../common/protocol';
 import { parseRepositoryRemotes, Remote } from '../common/remote';
+import { PR_SETTINGS_NAMESPACE, PULL_PR_BRANCH_BEFORE_CHECKOUT } from '../common/settingKeys';
 import { IResolvedPullRequestModel, PullRequestModel } from './pullRequestModel';
 
 const PullRequestRemoteMetadataKey = 'github-pr-remote';
@@ -188,14 +189,20 @@ export class PullRequestGitHelper {
 			const branchName = branchInfos[0].branch!;
 			progress.report({ message: vscode.l10n.t('Checking out branch {0}', branchName) });
 			await repository.checkout(branchName);
-			const remote = readConfig(`branch.${branchName}.remote`);
-			const ref = readConfig(`branch.${branchName}.merge`);
-			progress.report({ message: vscode.l10n.t('Fetching branch {0}', branchName) });
-			await repository.fetch(remote, ref);
+
+			// respect the git setting to fetch before checkout
+			if (vscode.workspace.getConfiguration(PR_SETTINGS_NAMESPACE).get<boolean>(PULL_PR_BRANCH_BEFORE_CHECKOUT, true)) {
+				const remote = readConfig(`branch.${branchName}.remote`);
+				const ref = readConfig(`branch.${branchName}.merge`);
+				progress.report({ message: vscode.l10n.t('Fetching branch {0}', branchName) });
+				await repository.fetch(remote, ref);
+			}
+
 			const branchStatus = await repository.getBranch(branchInfos[0].branch!);
 			if (branchStatus.upstream === undefined) {
 				return false;
 			}
+
 			if (branchStatus.behind !== undefined && branchStatus.behind > 0 && branchStatus.ahead === 0) {
 				Logger.debug(`Pull from upstream`, PullRequestGitHelper.ID);
 				progress.report({ message: vscode.l10n.t('Pulling branch {0}', branchName) });