Describe the Bug

If any HTML5 overlay is open, there is a chance that a token will jump to a seemingly random location at the start of a drag.

To Reproduce

1. Open a campaign.
2. Open an overlay, e.g., via [r, overlay("test"): {}]
3. Add a token to the map.
4. Start dragging the token while the mouse is in motion.
   • It's important not to hold the mouse over the token, then press, then drag. It needs to be a smooth operation.
5. Repeat step (4) until the issue surfaces. It should only take a few tries.

Expected Behaviour

Tokens should never jump at the start of a drag, whether or not overlays are open.

Screenshots

No response

MapTool Info

1.18.6

Desktop

Linux Mint 22.2

Additional Context

This is likely caused by #4946, with subsequent fixes failing to catch this specific issue caused by overlays.