Add notification when branch is auto-deleted after merge

[Copilot]

When branches are automatically deleted after merging a PR, users receive no feedback about the deletion or branch switch. This required manually checking git status to confirm what happened.

Changes

Modified autoDeleteBranchesAfterMerge in pullRequestReviewCommon.ts to:

• Show contextual notifications based on deletion outcome:
  • Local and remote deleted: "Deleted local and remote branches for {name} and switched to {default}"
  • Local branch deleted: "Deleted local branch {name} and switched to {default}"
  • Remote only: "Deleted remote branch {name}"
• Only show notification when branch name is available

The notification always mentions switching to the default branch when a local branch is deleted, providing clear feedback to users about the automatic cleanup and branch state.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Branch auto delete has no signal to the user</issue_title>
<issue_description>Verifying #1497

The verification worked as expected, but I had to verify by manually checking which branch I was on. I would have expected some sort of signal that the branch I was on was deleted and I was moved back to master.</issue_description>

<agent_instructions>Show a notification when the branch is deleted after merge. </agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Branch auto delete has no signal to the user #8357

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[alexr00]

@copilot Don't check if isBranchActive.

[Copilot]

Done in ec41eb4. Removed the isBranchActive check - the notification now always mentions switching to the default branch when a local branch is deleted.

[Copilot]

Pull request overview

This pull request adds user notifications when branches are automatically deleted after merging a PR. The change addresses a user experience gap where users had to manually check git status to confirm branch deletion and branch switching.

Key changes:

• Modified autoDeleteBranchesAfterMerge to display contextual notifications based on which branches were deleted (local, remote, or both)
• Updated the return value handling from performBranchDeletion to determine what notifications to show
• Included unrelated VS Code Chat Session Provider API updates

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/github/pullRequestReviewCommon.ts	Added notification logic to inform users when branches are auto-deleted after merge, with contextual messages based on deletion type
src/@types/vscode.proposed.chatSessionsProvider.d.ts	Removed deprecated provideNewChatSessionItem method and added onDidChangeChatSessionProviderOptions event (unrelated to PR purpose)

[Copilot]

The notification messages claim that the user was "switched to {defaultBranch}", but this is only accurate when the deleted branch was the currently active branch. Looking at the performBranchDeletion function (line 396-410), when deleting a local branch, the switch to the default branch only occurs if isBranchActive is true. If the deleted branch was not active, no branch switch happens, making these messages misleading.

Consider checking whether a branch switch actually occurred before including "and switched to {defaultBranch}" in the message, or track whether the branch was active and only mention the switch when it actually happened.

Suggested change

	vscode.l10n.t('Deleted local and remote branches for {0} and switched to {1}.', branchName, defaultBranch)
	);
	} else if (wasLocalDeleted) {
	vscode.window.showInformationMessage(
	vscode.l10n.t('Deleted local branch {0} and switched to {1}.', branchName, defaultBranch)
	vscode.l10n.t('Deleted local and remote branches for {0}.', branchName)
	);
	} else if (wasLocalDeleted) {
	vscode.window.showInformationMessage(
	vscode.l10n.t('Deleted local branch {0}.', branchName)