Workarea not updated after deleting display math, on current master

[Scott Kostyshak]

To reproduce:

1. Open the attached document.
2. Select all.
3. Backspace (to delete everything).

I get the attached screenshot.

Can anyone reproduce?

By the way, my secret goal with this batch of bug reports on current
master is to ruin JMarc's Friday evening/weekend :)
However, I think he has healthy work habits so hopefully he doesn't
check his emails.

Scott
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