Placeholder styles aren't rendering across multi-week drags

[tyler-dane]

Where did this happen?

No response

Expected Behavior

When dragging an event to another week and then back to its original, the placeholder event should be transparent.

Current Behavior

place-bug.mov

Steps to Reproduce

1. Create event
2. Drag it to the previous week, without releasing mouse
3. Drag it back to the original week
4. Notice: There are duplicate events with identical styling

Possible Solution

Style the placeholder properly when dragging an event

Context

Styling the placeholder like this is important to help the user distinguish between the old and new event