Fix the crash on animating the accessibility floating menu.

Root cause:
The menu had been animating and moving to the screen edge and hiding the menu in the meantime.

Solution:
Should cancel the animation before hiding the menu.

Bug: 237217858
Test: atest AccessibilityFloatingMenuViewTest
Change-Id: I75f75de3299210ed9d88b3be7dbaa81abb7db2e1

packages/SystemUI/src/com/android/systemui/accessibility/floatingmenu/AccessibilityFloatingMenuView.java

@@ -353,6 +353,7 @@ public class AccessibilityFloatingMenuView extends FrameLayout
         }
 
         mIsShowing = false;
+        mDragAnimator.cancel();
         mWindowManager.removeView(this);
 
         setOnApplyWindowInsetsListener(null);

packages/SystemUI/tests/src/com/android/systemui/accessibility/floatingmenu/AccessibilityFloatingMenuViewTest.java

@@ -190,6 +190,16 @@ public class AccessibilityFloatingMenuViewTest extends SysuiTestCase {
         verify(mWindowManager, times(1)).removeView(eq(mMenuView));
     }
 
+    @Test
+    public void hideMenuViewWhenStartingAnimation_animatorNotRunning() {
+        mMenuView.show();
+
+        mMenuView.mDragAnimator.start();
+        mMenuView.hide();
+
+        assertThat(mMenuView.mDragAnimator.isRunning()).isFalse();
+    }
+
     @Test
     public void onTargetsChanged_singleTarget_expectedRadii() {
         final Position alignRightPosition = new Position(1.0f, 0.0f);