Last commit to merge-request with skip-ci doesn't run merge pipeline anymore
### Summary We use merge request to build our official releases. Often we do very small changes at the end on the source branch with [skip-ci] to prevent running all our pipeline twice (pipelines are slow on our codebase ~1hr). This used to work without issues but as of recent changes on gitlab.com, when I tried it today my pipeline on the release branch just said, "Skipped" (because the last commit probably contained a message with [skip-ci] (single commit merge request). ### Steps to reproduce Create a branch source. Merge non-fast-forward into branch release Make a single change to source with [skip-ci] in the commit message Merge using merge request into release again. Note that the pipeline is not run now. ### Example Project - ### What is the current *bug* behavior? Pipelines are skipped ### What is the expected *correct* behavior? Pipelines for the result of the merge are still executed ### Relevant logs and/or screenshots - ### Output of checks This bug happens on GitLab.com #### Results of GitLab environment info #### Results of GitLab application Check ### Possible fixes labels: gitlab-ce~2278648 gitlab-ce~3630472
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