Browser freezes indefinitely on movement of custom light-entity-card card

[aleksstevcic]

Checklist:

• [y] I updated to the latest version available
• [y] I cleared the cache of my browser

Release with the issue: 0.04

Last working release (if known): none

Browser and Operating System: Microsoft Edge (Chromium), Windows 10

Description of problem: When adding light-entity-cards, they will display at the top left all on top of each other, and moving them around will cause the browser to freeze indefinitely.

Using: https://github.com/ljmerza/light-entity-card

Javascript errors shown in the web inspector (if applicable):

Additional information:

[zsarnett]

I can't support every custom card right now. Once I finish a version that works for core cards I will look into why its breaking for custom.