`1 | 1 | 1` became `1 | [1 | 1]`, and the nesting is the whole difference.
Three siblings means every divider sits between two of them: widening the editor took from the preview,
and dragging the nav re-proportioned all three. Three panels that could only be sized against each
other.
Nested, the outer divider moves the nav against THE WORK and the inner one splits the work between
looking and changing. Those are the two questions somebody actually has — "give me more room" and "I
need more of the controls right now" — and each is one drag that leaves the other answer alone.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
pastilhasandClaude Opus 5
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