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+## #142 — Empty item-slot press+drag+release still emits a Click
+
+**Status:** OPEN
+**Severity:** LOW
+**Filed:** 2026-06-20
+**Component:** ui — D.2b drag-drop spine (B.1)
+
+**Description:** Pressing an EMPTY `UiItemSlot`, moving the cursor >3 px (which makes `UiRoot.BeginDrag` cancel the drag because the empty cell's `GetDragPayload()` returns null), then releasing over the same cell still emits a `Click` (the press becomes a click on release, since no drag armed). This is the toolkit's general click semantics — every non-draggable widget (buttons included) fires Click after sub-gesture mouse movement; only an *armed* drag suppresses the click. Today it is a **no-op**: the toolbar's `Clicked` handler guards `if (Cell.ItemId != 0)`, so an empty-slot click uses nothing.
+
+**Root cause / status:** Surfaced in the B.1 spine code review (Task 3). Whether retail fires nothing vs. a no-op click on an empty cell after a >3 px move is **unverified** — deliberately NOT "fixed" with a speculative `_dragCancelled` guard, because that would make empty item-slots behave differently from every other widget and would be guessing at retail behavior (CLAUDE.md forbids both). Becomes relevant only if a future panel (e.g. the inventory grid in Stream C) wires an empty-cell click handler that does NOT guard on occupancy. Action when touched: verify retail's empty-cell press+move+release behavior (cdb/decomp) before changing anything; if it must differ, it earns a divergence-register row.
+
+**Files:** `src/AcDream.App/UI/UiRoot.cs` (`BeginDrag` cancel path, `OnMouseUp` Click emit), `src/AcDream.App/UI/UiItemSlot.cs` (`OnEvent` Click→Clicked).
+
+**Research:** `docs/superpowers/specs/2026-06-20-d2b-drag-drop-spine-design.md` §6.
+
+---
+
 ## #141 — Toolbar interactivity — selected-object display
 
 **Status:** IN PROGRESS (D.5.3a health + name + flash — DONE & visually confirmed 2026-06-20; mana + stack slider still deferred). Renumbered from #140 on the 2026-06-20 main merge — A7 Fix D held #140 on main; this branch's commits/spec still reference #140.