Enable edit prediction and Copilot for untitled buffers

[tacshi]

Closes #45631

Recording:

buffer_prediction.mp4

Release Notes:

• copilot: Edit predictions now work in temporary files

[zed-industries-bot]

	Messages
📖	This PR includes links to the following GitHub Issues: #45631 If this PR aims to close an issue, please include a Closes #ISSUE line at the top of the PR body.

Generated by 🚫 dangerJS against 1c680f0

[Copilot]

Pull request overview

Enables edit predictions (including Copilot) to work for buffers that have no on-disk file association (e.g., buffers created via workspace: new file), addressing the regression described in #45631.

Changes:

• Register singleton buffers with Copilot even when the buffer has no associated file.
• Use a unique synthetic path (untitled-{remote_id}) for Zeta requests when the buffer has no file, avoiding collisions between multiple untitled buffers.

Reviewed changes

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

File	Description
crates/zed/src/zed/edit_prediction_registry.rs	Removes the “must have a file” gate so Copilot can register untitled buffers.
crates/edit_prediction/src/zeta.rs	Changes Zeta’s fallback excerpt path from a constant to a per-buffer synthetic path based on remote_id.

Comments suppressed due to low confidence (1)

crates/zed/src/zed/edit_prediction_registry.rs:267

• The Copilot provider behavior was changed to register singleton buffers even when they have no associated file. There’s no regression test covering this untitled-buffer path (this file already has gpui tests), so it’s easy for the original file().is_some() guard to accidentally come back. Consider adding a test that constructs an editor with a singleton buffer without a file handle and asserts that Copilot registration still happens when the provider is Copilot.

        Some(EditPredictionProviderConfig::Copilot) => {
            let ep_store = edit_prediction::EditPredictionStore::global(client, &user_store, cx);
            let Some(project) = editor.project().cloned() else {
                return;
            };
            let copilot =
                ep_store.update(cx, |this, cx| this.start_copilot_for_project(&project, cx));

            if let Some(copilot) = copilot {
                if let Some(buffer) = singleton_buffer {
                    copilot.update(cx, |copilot, cx| {
                        copilot.register_buffer(&buffer, cx);
                    });
                }

---

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[tacshi]

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[tacshi]

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[tacshi]

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[osiewicz]

Thank you! Sorry for keeping you waiting.