Fix Hunter's Book animation SetPoint errors

The window's first anchor is relative to a child, so SlideIn/SlideOut's
position tween threw '<child> is dependent on this' every tick. Switch the
open/close/tab/search animations to alpha-only fades (matches the option labels).

api/hunterbook.lua

@@ -12,12 +12,9 @@ local function MTH_BOOK_FadeInWindow(frame)
 	-- book renders fully opaque for one frame before the tween's onStart snaps it
 	-- to 0 -- a flash that makes the fade look like it never happened.
 	if type(frame.SetAlpha) == "function" then frame:SetAlpha(0) end
-	-- Slide the whole window up into place while fading in. Position and alpha are
+	-- Fade only: the window's first anchor is relative to a child, so a position
-	-- the only safe properties on a complex frame: the built-in "scale" tween
+	-- tween's per-frame SetPoint throws "<child> is dependent on this". Alpha is safe.
-	-- resizes width/height, which the child widgets do NOT follow (they clip), so
+	Sauce:FadeIn(frame, 0.5, "outQuad")
-	-- a slide + fade is the strongest effect that keeps the layout intact. A
-	-- bigger travel + springy "outBack" overshoot makes the entrance pop.
-	Sauce:SlideIn(frame, "UP", 110, 0.5, "outBack")
 end
 
 -- Fade the results list back in when switching Hunter's Book tabs, unless disabled.
@@ -27,9 +24,8 @@ local function MTH_BOOK_AnimateTabSwitch()
 	local list = getglobal("MTH_BOOK_ListBackdrop")
 	if not list then return end
 	if type(list.SetAlpha) == "function" then list:SetAlpha(0) end
-	-- Slide the list in from the right while fading so the tab change reads as
+	-- Fade only (position tween SetPoint is unsafe on this anchor; see FadeInWindow).
-	-- motion rather than a faint brightness bump.
+	Sauce:FadeIn(list, 0.3, "outQuad")
-	Sauce:SlideIn(list, "RIGHT", 55, 0.3, "outCubic")
 end
 
 -- Fade the book window out before hiding it, unless disabled (shares the
@@ -42,17 +38,11 @@ local function MTH_BOOK_FadeOutWindow(frame)
 		frame:Hide()
 		return
 	end
-	-- Capture the resting anchor so SlideOut's downward displacement can be
+	-- Fade only (position tween SetPoint is unsafe on this anchor; see FadeInWindow).
-	-- restored once the window is hidden (otherwise the next open is offset).
+	Sauce:FadeTo(frame, 0, 0.26, "inQuad", {
-	local p, rel, rp, x, y = frame:GetPoint(1)
-	Sauce:SlideOut(frame, "DOWN", 90, 0.26, "inCubic", {
 		onFinish = function()
 			frame:Hide()
 			if type(frame.SetAlpha) == "function" then frame:SetAlpha(1) end
-			if p then
-				frame:ClearAllPoints()
-				frame:SetPoint(p, rel, rp, x, y)
-			end
 		end,
 	})
 end
@@ -64,8 +54,8 @@ local function MTH_BOOK_AnimateSearchResults()
 	local list = getglobal("MTH_BOOK_ListBackdrop")
 	if not list then return end
 	if type(list.SetAlpha) == "function" then list:SetAlpha(0) end
-	-- Slide the refreshed list in from the right so a search visibly refreshes.
+	-- Fade only (position tween SetPoint is unsafe on this anchor; see FadeInWindow).
-	Sauce:SlideIn(list, "RIGHT", 45, 0.26, "outCubic")
+	Sauce:FadeIn(list, 0.26, "outQuad")
 end
 
 MTH_HUNTERBOOK_LOADED = true