Cursor height regression (wrt 2.2.0)

[Scott Kostyshak]

steps to reproduce:

1. Open the attached .lyx file.
2. Select all.
3. Delete.

Cursor is shorter than expected. If you do

4. Type "a".
5. Backspace.

Now the cursor is back to expected height.

I see this back to 2.3.0 but not on 2.2.0. I can bisect if it would be worth the time.

Scott
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