After merge, the master branch shows a graph I did not understand at all.
So I was at commit id 4255f88, the other guy merged my code and proceeded to commit id 647b2fd, then I merged his 647b2fd and get c3193e1. But the branch tree did not show the graph I expected (as I pointed here), instead it shows my latest commit id c3193e1 is merged from that purple one, which I have no idea at all where does it come from?!
BTW, here I chose "create a commit even fast-forward", but I had tried fast-forward either and got the same result.
You do have uncommitted changes (the top line in the screenshot, with the empty grey circle on the left in the graph and "*" in the Commit column), which have two parents (the two grey lines coming from the empty circle). This means that you are in the middle of a merge. You can use the "Reset All" Option in the Discard dialog to abort the merge.
I just clicked merge button and sourcetree popped up a dialog said "Pick a commit to merge into your current branch". This is what I always do when I merged others' codes and I nerve had a problem before till now. I just want to get rid of that purple line and let my latest commit shows it came from 647b2fd. What can I do now ?
I've seen this before as well. Occasionally when I merge a branch into my own (I merge branches, not commits), SourceTree draws the graph such that the merge parent is some commit in the distant past that I can't find rather than the recent commit that is the head of the branch I merged.
I haven't been able to figure out how to consistently reproduce this or whether it's a bug in SourceTree or Git. It doesn't really have any impact on my workflow, so I just ignore it. If you want to file a bug - jira.atlassian.com.
As Balazs said, you've already pushed to origin, so there's not much you can do to fix it at this point.
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