Scott Kostyshak f1accdebf3 Refresh previews on branch toggle
We only referesh previews if the branch that is toggled exists in a
descendant. This code could be further optimized, as noted in the
comments.

For relevant discussion, see the following ML thread:

https://www.mail-archive.com/search?l=mid&q=20191209022030.d6gyy3abdectr3yz%40tallinn
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