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The canvas previews the drop before it happens - #45
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While a field is dragged over the canvas — or a repeater's zone — a slot the size of the dragged card now follows the pointer: the card leaves the flow, its neighbours slide out of the way with first/last position transforms, and the list shows, in real time, exactly the layout releasing would produce. The drop then reads the gap's own index instead of re-measuring the pointer, because with a card-sized hole open the cards are nowhere near where a measurement of the restored layout would put them. The fallback drag manager learns to emit the same `os.drag.*` lifecycle events the shell's manager broadcasts, so the gap draws from one event stream under either manager instead of silently never appearing without the shell. (Recovered from the long-lived working-tree WIP and rebased over the alltfo_ rename; typecheck and the full vitest suite pass.) Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0119U4sRRWGcTQdwYreTwpAp
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While a field payload is over the canvas — or a repeater's zone — a slot the size of the dragged card follows the pointer: the card leaves the flow, its neighbours slide out of the way with first/last-position transforms, and the list previews, in real time, exactly the layout the drop will produce. The drop then reads the gap's own index instead of re-measuring the pointer, because with a card-sized hole open, a re-measured index lands the field a slot away from where the gap said it would.
The fallback drag manager learns to emit the same
os.drag.*lifecycle events the shell's manager broadcasts, so the gap draws from one event stream under either manager.Recovered from the long-lived working-tree WIP, rebased over the
alltfo_rename and synced with the delete-form merge. Typecheck + 372 vitest tests green; QA'd on 8889 — reorders land exactly on the previewed slot.🤖 Generated with Claude Code
https://claude.ai/code/session_0119U4sRRWGcTQdwYreTwpAp