the action bars' empty slots go ghost, and a rooted creature stays put

- picking a spell up off the bar no longer blacks out every empty slot: `UI-Quickslot` is a FILLED 60%-black plate, not a hollow ring (decoded off the shipped BLPs — Quickslot2's interior is RGBA 0,0,0,0, Quickslot's 0,0,0,153), and the reference dims it to half alpha in `ActionButton_ShowGrid`, so an empty well now ghosts at 30% black where it read as a hole; the wow-re cross-check then found the reference never UN-dims it (a 3-argument `SetVertexColor` preserves the current alpha at `0x79abd0`, and `SetNormalTexture` reuses the region), so in the real client the first drag leaves every button's border at half alpha for the rest of the session — benilla ends the dim on purpose and records it as the divergence it is (1782)
- the bag bar is the reference's own `MainMenuBarBagButtons.xml` (window 3 of the stock-first migration), and the swap found a real bug rather than a move: the reference's `ItemAnim_OnEvent` matches a push against the button's inventory-slot id (20..23) and benilla emitted its own container numbering (1..4), so all four bag-push cards would have silently never played against the stock body — `push_container` now emits the reference's selector (`bag + 1`), which is what an addon expects anyway; beside it, a readiness probe that asks the LOADER, not a grep, which of the 85 stock windows load off the player's chain today (58 do; the 27 that don't name their own blocker)
- a rooted, hovering, water-walking or walking creature reached benilla as an unhandled opcode: the twelve `SMSG_SPLINE_MOVE_*` (the observer twin of the ack'd force family — bare packed guid, no ack, any unit) now decode into one MOVEMENTFLAGS word per unit, which benilla kept for our mover and for a relayed player and not at all for a creature, the one body this family is ever addressed to; ROOT wipes the direction bits so the dead-reckon stops walking a rooted body on for its next heartbeat (`0x7c7340`), HOVER clears a yard off the floor without climbing a body already inside that yard (`0x636e81`), WATERWALK elects the liquid surface against the terrain, SAFE_FALL's terminal is 7.0 not 60.148 (`0x7c5d23`), and SET_RUN_MODE's bool is inverted against the bit, folded at the parse; the inspect card names a unit's granted modes in words (`granted rooted+hover`) so a creature resting a yard off the floor reads as intended rather than broken

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

crates/benilla-ui/src/script/region/paint.rs

@@ -38,6 +38,22 @@ pub(super) fn install(lua: &Lua, m: &Table) -> mlua::Result<()> {
         })?,
     )?;
 
+    // **KNOWN DIVERGENCE, byte-pinned and deliberately not closed here (decision 1782).** An
+    // ABSENT alpha argument is 1.0 below; in the reference it is *the alpha already on the region*.
+    // `0x79abd0` reads the current colour back (`0x79ac81` -> `0x77f8c0`), packs the caller's rgb
+    // against an `a` default of 1.0 (`0x79ad43`), and then asks a SECOND time whether argument 5
+    // was present — when it was not, it copies byte 3 of the read-back colour over the packed
+    // alpha (`0x79adfe`/`0x79ae0a`) before the store. So `SetVertexColor(r, g, b)` on 1.12.1 is
+    // `SetVertexColor(r, g, b, currentAlpha)`, and a three-argument call CANNOT restore opacity.
+    // wow-re `system/ui/scratch/button-state-texture-path-setter.md` §7.
+    //
+    // Why it still says 1.0: the fix is one line, but its blast radius is every three-argument
+    // call in FrameXML and in the addon corpus, and it only bites where a region already carries
+    // alpha < 1 — where it would surface as art going permanently translucent, which is a LOOK and
+    // therefore the director's call, not a quiet correction to fold into an unrelated slice. The
+    // known live case is the action bar's grid ring, and `ActionBar.xml`'s
+    // BenillaActionButton_SetRing is already written to be correct under BOTH readings (it passes
+    // the fourth argument explicitly), so closing this cannot silently change that file.
     m.set(
         "SetVertexColor",
         lua.create_function(