How to run a new build automatically when an original branch changed

[michaelstr]

Test case:

2 pull requests starting from master branch at the same time. Both have successful builds. First pull request merged. Now, the second pull request could potentially fail if the first one, for example, changed api.

How I can start a new build automatically (or to invalidate previous build) when a master branch changes?

[Alexey Matveev]

Hello,

I am not sure what you mean. Each merged pull request to the master branch will cause the master branch to be rebuild.

[michaelstr]

I need to rebuild all unmerged pull requests that are branched off the master.