For our build environment, I am using the Git plugin (1.1.13) with Jenkins.

In order to do incremental builds to cut down on total build time, I am using the excluded regions feature of the plugin. This feature appears to work, but only after one check-in.

Here's my example:

Check-in for project A.
Project A builds.
Check-in for project B.
Project B builds (Project A correctly ignores the check-in for project B).
Check-in for project B.
Project A and B build (Project A does not ignore the check-in for project B when there are multiple check-ins to ignore).

This issue appears to be similar to JENKINS-8342, however it does not appear to be dependent on the quiet period. This issue will happen 100% of the time in my environment when trying to ignore a 2nd check-in. I don't know after that point because the ignore list presumably gets reset after a build.

This issue affects plugin version 1.1.12 and 1.1.13 in my testing.