When creating a pull request from fork1 branch1, to the parent repository's default branch, the "Close branch after the pull request is merged" option is disabled.
If you are pulling a request across branches, you can have the option to close the branch when your request is merged. Whether you have this option depends on whether the repository is Git or Mercurial. Mercurial repositories always have this option. Git repositories have this option if the repo administrator allows it; Otherwise, the option is greyed out.
This is in the Bitbucket documentation on this page: https://confluence.atlassian.com/display/BITBUCKET/Work+with+pull+requests</span<>>
The reason it is grey out is because you prevented bookmark deletion. This seems to be a bug, as the documentation states that "you can also prevent users from deleting branches (Git) or bookmarks (Mercurial)", which might be equating branches with bookmarks, even though the Branch Management page states the following: "These rules only apply to bookmarks. Users can still close a branch; closing a branch does not remove it from history."
I've added an issue about this problem.
As a project manager, I have discovered that different developers want to bring their previous branching method with them when they join the team. Some developers are used to performing individual wo...
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