feat(review): editable Files Changed panel with CM6 + in-place updates + sidebar fixes

[jeonghun-jj-lee]

Summary

Replaces the read-only @pierre/diffs renderer in Files Changed with an editable CodeMirror 6 diff view, plus sidebar UX fixes and a scroll-stable in-place update architecture.

Editable diff view

• EditableDiffView CM6 component — split/unified modes, syntax-highlighted, editable modified pane
• In-place document updates via minimalChanges() dispatch — no destroy/recreate on content changes, scroll stays put
• In-place readOnly toggle via Compartment.reconfigure() — no scroll jump on agent start/end
• Auto-save on edit, revert to agent version, concurrent edit detection
• Markdown preview toggle for .md files
• File-picker dropdown with horizontal scroll for long paths

Lock editing while agent is busy

• Yellow lock chip (Harmoniqs accent) centered at top of diff view
• readOnly wired through isAgentBusy prop chain
• Programmatic updates go through even when readOnly (custom transactionFilter removed; CM6 built-in facets sufficient)

Sidebar fixes

• Ghost entries for deleted files with strikethrough + restore context menu
• Click suppression for ghost entries, post-restore click fix
• Drag auto-scroll with requestAnimationFrame loop
• 300ms filesystem watcher debounce to prevent flickering
• retainContextWhenHidden on webview provider
• Redundant section-order render guard

Diff pipeline

• mergeServerAndToolDiffs in accumulate-diffs.ts with projectPrefix
• applyRenames for file-move tracking
• Write tool filediff metadata (diffLines computation)
• diff_version bump on tool completion (in fork)
• Cross-project file visibility fix

Type fixes

• SessionReviewDiffStyle widened to include "preview"
• process.env.HOME type narrowing

Test coverage

• 61 fork-side tests (editable-diff-view: minimalChanges, updateOriginal, updateModified, setReadOnly, Compartment)
• 2414 amicode tests pass (0 failures)

Companion PR

opencode fork: harmoniqs/opencode — feat/issue-766-editable-files-changed branch (25 commits on local/amicode)

[coderabbitai]

Important

• 🔍 Trigger review

This repository does not receive automatic reviews because it has fewer than 10 stars.

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Team

Run ID: b78d047a-6888-4d43-abbb-33de0fe1ef1d

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