The p=X and ft=Y query parameters on /timeline cause a timeline that shows all ancestors of X "back to" Y. We need a corresponding query parameter set to show descendants of X up to Y.

A related request is to allow both bt=Y1 and ft=Y1 on a pd=X request.

The argument to the ft= query parameter should be resolved as the earliest matching tag in the descendant set of X, not as the latest chronological match. See ticket ed62a4d35332595a.

Use case

If a bisect lands on version X, this feature could be used as "p=X&ft=release" to figure out the first release in which the problem appears.