Show commit count as decoration on Commits tree node

[Copilot]

• Reverted description-based approach as requested
• Added CommitsNode scheme to URI types
• Created helper functions for CommitsNode URI
• Added resourceUri to CommitsNode
• Created CommitsDecorationProvider
• Registered CommitsDecorationProvider in extension.ts
• Build and lint checks pass
• Replied to first comment with implementation details
• Added owner and repo to CommitsNodeUriParams
• Use Schemes.CommitsNode constant in URI parsing
• Listen for timeline changes to update commit count decoration

Original prompt

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This section details on the original issue you should resolve

<issue_title>Show the pull request commit count somewhere</issue_title>
<issue_description>

I'd love to be able to see the commit count somewhere in the tree, status bar, or both. I often interactively rebase all pull request commits and need to know the count so I can do something like: git rebase -i HEAD~<count>.</issue_description>

<agent_instructions>Show the commit count as a decoration on the "Commits" tree element of the PullRequestChangesTreeDataProvider.</agent_instructions>

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

Fixes #5150

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[andyshinn]

Cool! I could try it out if there was a way for me to build or pull down a pre-built VS Code to test. Is that a thing that exists?

[alexr00]

@andyshinn, not really. But, once the PR is merged then the next day you'll be able to try it out in the pre-release version of the GitHub Pull Request extension.

[alexr00]

@copilot, don't use the description of the tree node. Instead use a file decoration.

[Copilot]

@copilot, don't use the description of the tree node. Instead use a file decoration.

Done in 861832d. Changed to use a file decoration with badge showing the commit count instead of using the tree node's description property.

The implementation:

• Added a new CommitsNode scheme to the URI system
• Created CommitsDecorationProvider that provides file decorations for the Commits node
• Set resourceUri on the CommitsNode so it receives the decoration
• The badge displays the commit count (e.g., "5") with a tooltip showing "{count} commits"

The decoration will appear as a badge next to the "Commits" label in the tree view, similar to how other decorations work in VS Code (e.g., file status badges).

[alexr00]

@copilot Should also include the owner and repo in the params

[Copilot]

Done in eaaa39d. Added owner and repo to CommitsNodeUriParams and updated the createCommitsNodeUri function to accept these parameters.

[alexr00]

@copilot use Schemes.CommitsNode instead of using the string directly.

[Copilot]

Done in eaaa39d. Changed to use Schemes.CommitsNode instead of the string literal 'commitsnode'.

[alexr00]

@copilot this can change, when for example the pr timeline changes.

[Copilot]

Done in eaaa39d. Updated to listen for onDidChange events with timeline: true and fire decoration updates when the PR timeline changes, which includes new commits being added.