Add diff indicators support to chat multi-diff content part

[Copilot]

The coding agent changed files list was missing the green/red diff indicators (+12 -0) that show lines added and removed, unlike regular chat which displays these indicators correctly.

Before

After

Changes Made

Extended IChatMultiDiffData Interface

Added optional diffMeta field to resource entries to carry diff statistics:

diffMeta?: {
  added: number;
  removed: number;
};

Enhanced ChatMultiDiffListRenderer

• Added diff indicator elements to template (fileDiffsContainer, addedSpan, removedSpan)
• Display "+X -Y" indicators when diff metadata is available
• Hide indicators when no diff metadata is present
• Added proper accessibility labels for screen readers

Backward Compatibility

The changes are fully backward compatible - existing callers that don't provide diff metadata will continue to work unchanged, while new callers can optionally include diff statistics.

The fix ensures that when coding agents modify files, users see the same helpful diff indicators (+lines added, -lines removed) that appear in regular chat, providing better transparency about the scope of changes.

Recent Updates

• Extended IChatMultiDiffData interface to include optional diffMeta field
• Enhanced ChatMultiDiffListRenderer to display diff indicators (+X -Y)
• Added proper accessibility labels for screen readers
• Maintained backward compatibility with existing callers
• Fixed formatting issue - removed extra blank line

Fixes #258613.

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[joshspicer]

@copilot No, the change needs to be made in src/vs/workbench/contrib/chat/browser/chatContentParts/chatMultiDiffContentPart.ts. You should optionally allow this data to be provided by the caller (along with the file name, diffs, etc...)

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[joshspicer]

@copilot No, the change needs to be made in src/vs/workbench/contrib/chat/browser/chatContentParts/chatMultiDiffContentPart.ts. You should optionally allow this data to be provided by the caller (along with the file name, diffs, etc...)

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[Copilot]

@copilot No, the change needs to be made in src/vs/workbench/contrib/chat/browser/chatContentParts/chatMultiDiffContentPart.ts. You should optionally allow this data to be provided by the caller (alon...

You're absolutely right! I moved the change to chatMultiDiffContentPart.ts as requested. The fix now:

1. Extends IChatMultiDiffData to optionally include diffMeta with added/removed line counts
2. Updates the ChatMultiDiffListRenderer to display "+X -Y" indicators when diff metadata is provided
3. Properly handles cases where no diff metadata is available (hides indicators)

The caller can now optionally provide diff statistics along with file names and diff URIs, and they'll be displayed just like in the regular chat references.

Commit: 23c37b4

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[mofreh345]

اطفاء شبكة مربوطه في الراس في الثلاثاء، ٢ سبتمبر ٢٠٢٥، ٧:١٦ م Copilot ***@***.***> كتب:

…

*Copilot* left a comment (microsoft/vscode#264100) <#264100 (comment)> @copilot <https://gh.io/copilot-coding-agent-docs> No, the change needs to be made in src/vs/workbench/contrib/chat/browser/chatContentParts/chatMultiDiffContentPart.ts. You should optionally allow this data to be provided by the caller (alon... You're absolutely right! I moved the change to chatMultiDiffContentPart.ts as requested. The fix now: 1. Extends IChatMultiDiffData to optionally include diffMeta with added/removed line counts 2. Updates the ChatMultiDiffListRenderer to display "+X -Y" indicators when diff metadata is provided 3. Properly handles cases where no diff metadata is available (hides indicators) The caller can now optionally provide diff statistics along with file names and diff URIs, and they'll be displayed just like in the regular chat references. Commit: 23c37b4 — Reply to this email directly, view it on GitHub <#264100 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BQAQWQV4Z3HR64LWGYK5B2L3QW7HXAVCNFSM6AAAAACFFYQD52VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTENBVHE3TMOJVGY> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[joshspicer]

@copilot fix the formatting issue

[hygiene                  ] File not formatted. Run the 'Format Document' command to fix it: src/vs/workbench/contrib/chat/browser/chatContentParts/chatMultiDiffContentPart.ts
[extensions-ci-pr         ] [16:18:07] Bundled extension: git-base/extension.webpack.config.js...
[extensions-ci-pr         ] [16:18:08] Bundled extension: terminal-suggest/extension.webpack.config.js...
[hygiene                  ] [16:18:24] 'hygiene' errored after 2.07 min
[hygiene                  ] 
[hygiene                  ] [16:18:24] Error: Hygiene failed with 1 errors. Check 'build / gulpfile.hygiene.js'.
[hygiene                  ]     at formatError (/mnt/vss/_work/vscode/vscode/node_modules/gulp-cli/lib/versioned/^4.0.0/format-error.js:21:10)
[hygiene                  ]     at Gulp.<anonymous> (/mnt/vss/_work/vscode/vscode/node_modules/gulp-cli/lib/versioned/^4.0.0/log/events.js:33:15)
[hygiene                  ]     at Gulp.emit (node:events:530:35)
[hygiene                  ]     at Gulp.emit (node:domain:489:12)
[hygiene                  ]     at Object.error (/mnt/vss/_work/vscode/vscode/node_modules/undertaker/lib/helpers/createExtensions.js:61:10)
[hygiene                  ]     at handler (/mnt/vss/_work/vscode/vscode/node_modules/now-and-later/lib/map.js:50:14)
[hygiene                  ]     at f (/mnt/vss/_work/vscode/vscode/node_modules/once/once.js:25:25)
[hygiene                  ]     at f (/mnt/vss/_work/vscode/vscode/node_modules/once/once.js:25:25)
[hygiene                  ]     at tryCatch (/mnt/vss/_work/vscode/vscode/node_modules/async-done/index.js:24:15)
[hygiene                  ]     at done (/mnt/vss/_work/vscode/vscode/node_modules/async-done/index.js:40:12)
ERROR: "hygiene" exited with 1.

[Copilot]

@copilot fix the formatting issue

...

Fixed the formatting issue by removing the extra blank line. The file should now pass hygiene checks. Commit: dfb23a9