[Bug]: Azure DevOps PR Code tab disables line selection, so "Add to agent" is unreachable #19608

Before submitting

• I searched existing issues and did not find a duplicate.
• I included enough detail to reproduce or investigate the problem.

Area

apps/web

Steps to reproduce

1. Add a project whose remote is an Azure DevOps Services repository (dev.azure.com), with az + the azure-devops extension signed in.
2. Open one of its pull requests in the pull request panel and switch to the Code tab. The diff renders fine.
3. Try to select a line range (or use the gutter button) in order to use Add to agent and ask the agent about those lines.

Expected behavior

Line selection and Add to agent work the same way they do for a GitHub pull request. Sending a selection to the local agent does not post anything to the host, so it should not depend on whether the host supports writing review comments.

Actual behavior

Line selection and the gutter utility are disabled entirely for Azure DevOps pull requests, so there is no way to reach Add to agent from the Code tab.

The cause: in PullRequestCodeTab.tsx, both the selection and the draft that carries the Add to agent secondary action are gated on the host's ability to post inline review comments:

• const canCommentOnLines = review.inlineComment && commit === null;
• if (!range || !canCommentOnLines) return; in beginComment
• enableGutterUtility / enableLineSelection: canCommentOnLines && draft === null
• Add to agent is only a secondary action of that same draft

The Azure DevOps provider deliberately declares review: { inlineComment: false, ... }, so canCommentOnLines is always false there and the agent path goes away with it. The same presumably applies to any host, or any viewer without comment permission, where inlineComment resolves to false.

A possible fix: gate selection on review.inlineComment || onAddToAgentSelection !== undefined, and when the host cannot comment, open a draft that offers only Add to agent (no "Add to review").

Impact

Major degradation or frequent failure

Version or commit

v0.0.45; the gating is unchanged on main @ 348f217

Environment

Azure DevOps Services (dev.azure.com) repository, Azure CLI with the azure-devops extension, T3 Code server on Linux

Workaround

Reference lines manually in the chat composer (path/to/File.kt:42) instead of selecting them in the Code tab.