Why do merges of pull requests not display a line in the graph, showing the merge? We know what branch is being merged in, it's right in the pull request, but yet the graph shows no line connecting them back into one line??? It just looks like all branches never got merged in, but they did? Who decided this was the way to display the graph?
Hey, I know this is an old question, but I'm experiencing this problem and I'd like to give some input. I'm not a Git expert so I'm going to need some help piecing this together.
In SourceTree, when we merge a branch locally the merge itself has its own commit. In the branching graph, each commit is a node connected by colored lines. So for two lines to merge together they need to merge at a commit, and this would be the merge commit, conventionally with a description like "Merge branch A into B."
Pull requests in GitHub seem to be handled kind of differently. When a pull request is "merged" there's no merge commit. It seems to just use the commits in the pull request to make new commits on the master branch. I'm not exactly sure what's going on, but this seems to produce unexpected behavior.
I ran the command ">git log --oneline --abbrev-commit --all --graph" and found the commit I was looking for in the output, and it's the same as SourceTree's graph. But I noticed something about the graph that I had missed before. There are two copies of my commit: one in its own branch that's never been merged, and one in the master branch which must be where the pull request was "merged." What's going on here? Why is the PR showing up as a direct commit to the master branch rather than a branch that's been merged? Is this expected behavior, or is someone merging pull requests incorrectly?
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