Add regression test for accordion rapid-click exit animation (#2674)

dev/react/src/tests/animate-presence-accordion-rapid.tsx

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+import { AnimatePresence, motion } from "framer-motion"
+import { useState } from "react"
+
+const items = [
+    { id: "a", title: "Item A" },
+    { id: "b", title: "Item B" },
+    { id: "c", title: "Item C" },
+]
+
+function AccordionItem({ id, title }: { id: string; title: string }) {
+    const [open, setOpen] = useState(false)
+
+    return (
+        <div>
+            <button
+                className="trigger"
+                data-id={id}
+                onClick={() => setOpen((o) => !o)}
+            >
+                {title}
+            </button>
+            <AnimatePresence initial={false}>
+                {open && (
+                    <motion.section
+                        key="content"
+                        data-panel={id}
+                        initial={{ height: 0, opacity: 0 }}
+                        animate={{ height: "auto", opacity: 1 }}
+                        exit={{ height: 0, opacity: 0 }}
+                        transition={{
+                            type: "tween",
+                            ease: "linear",
+                            duration: 0.5,
+                        }}
+                        style={{ overflow: "hidden" }}
+                    >
+                        <div
+                            data-content={id}
+                            style={{ padding: 20, height: 100 }}
+                        >
+                            Content for {title}
+                        </div>
+                    </motion.section>
+                )}
+            </AnimatePresence>
+        </div>
+    )
+}
+
+export const App = () => {
+    return (
+        <div id="accordion" style={{ width: 400 }}>
+            {items.map((item) => (
+                <AccordionItem key={item.id} id={item.id} title={item.title} />
+            ))}
+        </div>
+    )
+}

packages/framer-motion/cypress/integration/animate-presence-accordion-rapid.ts

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+describe("AnimatePresence accordion rapid click (#2674)", () => {
+    it("Toggling open mid-exit leaves the panel visible at full height", () => {
+        cy.visit("?test=animate-presence-accordion-rapid")
+            .wait(200)
+            .get('[data-panel="a"]')
+            .should("not.exist")
+            // Open
+            .get('[data-id="a"]')
+            .trigger("click", { force: true })
+            // Wait for full open animation
+            .wait(800)
+            // Close
+            .get('[data-id="a"]')
+            .trigger("click", { force: true })
+            // Mid-exit (250ms into 500ms exit), re-open
+            .wait(250)
+            .get('[data-id="a"]')
+            .trigger("click", { force: true })
+            // Wait for animation to settle
+            .wait(1500)
+            // Panel should exist at full height
+            .get('[data-panel="a"]')
+            .should("exist")
+            .then(($el: any) => {
+                const height = parseFloat(
+                    getComputedStyle($el[0] as HTMLElement).height
+                )
+                const opacity = parseFloat(
+                    getComputedStyle($el[0] as HTMLElement).opacity
+                )
+                expect(height).to.be.greaterThan(100)
+                expect(opacity).to.equal(1)
+            })
+    })
+
+    it("Toggling closed mid-enter removes the panel", () => {
+        cy.visit("?test=animate-presence-accordion-rapid")
+            .wait(200)
+            // Open
+            .get('[data-id="a"]')
+            .trigger("click", { force: true })
+            // Mid-enter (250ms into 500ms enter), close
+            .wait(250)
+            .get('[data-id="a"]')
+            .trigger("click", { force: true })
+            // Wait for exit to finish
+            .wait(1500)
+            .get('[data-panel="a"]')
+            .should("not.exist")
+    })
+
+    it("Rapidly toggling many times ends in correct state (open)", () => {
+        cy.visit("?test=animate-presence-accordion-rapid")
+            .wait(200)
+            // 5 rapid clicks → ends open
+            .get('[data-id="a"]')
+            .trigger("click", { force: true })
+            .wait(50)
+            .get('[data-id="a"]')
+            .trigger("click", { force: true })
+            .wait(50)
+            .get('[data-id="a"]')
+            .trigger("click", { force: true })
+            .wait(50)
+            .get('[data-id="a"]')
+            .trigger("click", { force: true })
+            .wait(50)
+            .get('[data-id="a"]')
+            .trigger("click", { force: true })
+            .wait(2000)
+            .get('[data-panel="a"]')
+            .should("exist")
+            .then(($el: any) => {
+                const height = parseFloat(
+                    getComputedStyle($el[0] as HTMLElement).height
+                )
+                const opacity = parseFloat(
+                    getComputedStyle($el[0] as HTMLElement).opacity
+                )
+                expect(height).to.be.greaterThan(100)
+                expect(opacity).to.equal(1)
+            })
+    })
+})