[ci] Consider only files changed on the built branch #12627
Merged
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git diff COMMIT includes all files changed between COMMIT and the most recent common commit of COMMIT and HEAD. We only want files changed on this branch though.
You can see the old behavior at https://circleci.com/gh/mui-org/material-ui/41213
It also includes files that were changed on
master
during the lifetime of the branch.Tested this with the CircleCI checkout script and it worked as expected (only 6 files changed for that build). Earlier tests did non run on long living branches.