Expected Behavior
Other UI elements should not become highlighted when dragging a tile
Actual Behavior

Steps to Reproduce
- Go to the Costume List in the Paint Editor
- Begin dragging a Costume, explicitly beginning the drag the Costume Name or Size
- Drag over Sprite Info Area (as seen in GIF above).
Operating System and Browser
OS: macOS 10.13.5
Browser: Safari 11.11.1