AddGestureHandler without RemoveGestureHandler

[GentleHoatzin]

Hello, seeing the example DropdownVisuals code, i see that there are multiple AddGestureHandler, and i noticed that there are no corresponding RemoveGestureHandler in the same code.

It's required to call a RemoveGestureHandler, after i have finished using a AddGestureHandler?
Or i can leave it, without creating a memory leak of some sort?

For example, if i change scene

[twilightsight]

You can add it into OnDisable or Destroy method. I am not sure which one is a better choice. As scripts in nova samples say, maybe disable method is better.

[twilightsight]

However, I found sometimes when I called the removehandler method, the instance had been destroyed and a null exception raised. I am not sure what's going on. So I just add a judement before call the removing operation.