Filtering demo. Where is #619 pull request?

Dear Community.

I cannot make filtering demo install.

I cannot find pull request #619 to follow the direction:
"NOTE: As of this writing, v3.0.0 has not yet been released, nor is it in a committed branch. To build this demo today, pull #619 and build it in another folder .... "

In which branch is it? I don't see it in Github site and not sure what to do with this info:

git config --add remote.origin.fetch +refs/pull/*/head:refs/remotes/origin/pull/*
git fetch origin
* [new ref] refs/pull/619/head -> origin/pull/619

Thank you.
Konstantin.