Multitouch still dragging molecule when looking at different part of carousel

[KatieWoe]

Device
iPad
OS
iPadOS 13
Browser
Safari
Problem Description
For phetsims/qa#506.
If you are dragging a molecule with one finger and use the other to change the carousel to another page, you will still be dragging an invisible molecule. You can even drop it into the answer box like this. May not be worth addressing.
Steps

1. Go to first screen
2. Build a target molecule
3. Using touch, start dragging the molecule and don't let go
4. With another finger, hit one of the buttons to move to another carousel page
5. Drag your finger to the answer box and let go

Visuals

[Denz1994]

Good catch. We can kill the dragging input when the carousel pages change. Should be fixed in this dev version @KatieWoe.

[KatieWoe]

Looks good in the dev version

[Denz1994]

Nice. Closing this one.