Diff View frontend Crash when hovering over green area

Created by: jasongornall

• Sourcegraph version:
• Platform information:

Steps to reproduce:

https://sourcegraph.slack.com/archives/C03BV5AKHL6/p1653931960223449 Observe video.

1. Click this diff view and hover over green area
2. Notice crash in console and code intelligence stops working

Expected behavior:

no Crash

Actual behavior:

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