UIKit applies the split's preferred display mode while a collapsed split expands, before the new width reaches JS. The collapsed split asked for secondaryOnly whenever a detail was open, so unfolding first hid the sidebar and then slid it in once JS saw the wider window. A collapsed split now carries the display mode the expanded split will use, so the sidebar arrives with the expansion. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Julius Marminge committed on 10/21/2026, 11:43:06 PMparent29bdddb
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