[diffs/edit] add folding support

[ije]

• Can disable by add folding: false in the editor option
• Folding is restricted to File, never FileDiff.
• Support nested indentation ranges, edit remapping, navigation reveal, and virtualized geometry
• Chevron controls sit between gutter/content, reveal on gutter-zone hover, strengthen on direct hover, and support keyboard focus.

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Project	Deployment	Actions	Updated (UTC)
pierre-docs-diffs	Ready	Preview	Jul 22, 2026 2:20am
pierre-docs-diffshub	Ready	Preview	Jul 22, 2026 2:20am
pierre-docs-trees	Ready	Preview	Jul 22, 2026 2:20am
pierrejs-diff-demo	Ready	Preview	Jul 22, 2026 2:20am

[ije]

@codex review

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Avoid sending folded bodies through render windows

When a viewport contains both the folded header and the first visible line after a large collapsed body (for example folding lines 1–19990), startingLine can be the header while finalLine is after the fold, so this returns a render window spanning the entire hidden body. FileRenderer.renderFile forwards startingLine/totalLines into windowed plain rendering before it skips foldRanges, which means large folded regions are still sliced/joined/tokenized even though only a few visible rows are needed; please avoid passing hidden spans to the renderer or make that path skip folded bodies.

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