And bring back old cleanup code, which now seems to work better post-yield-abandonment.

Accessible.gd

@@ -634,3 +634,9 @@ func _process(delta):
         if node.is_inside_tree() and not node.get_focus_owner():
             node.get_tree().root.warp_mouse(node.rect_global_position)
             timer = null
+
+func free():
+    if timer:
+        timer.unreference()
+        timer = null
+    .free()

ScreenReader.gd

@@ -86,6 +86,11 @@ func _enter_tree():
     connect("swipe_up", self, "swipe_up")
     connect("swipe_down", self, "swipe_down")
 
+func _exit_tree():
+    for accessible in accessibles:
+        accessible.free()
+    accessibles = []
+
 func press_and_release(action):
     var event = InputEventAction.new()
     event.action = action