[users at bb.net] Collapsing Builds Per Branch?

[Chris Spencer]

How do you collapse builds so Buildbot doesn't build every single commit
separately for a branch? It should also cancel a running build for a branch
if there's a newer commit pending.

My builder looks like:

c['builders'].append(
    util.BuilderConfig(
        name="runtests",
        workernames=["example-worker"],
        collapseRequests=True,
        factory=factory))

I thought collapseRequests=True did this, but it seems to have no effect.
Every commit to a branch shows up as a separate pending build.
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