Add support for Github stacked pull requests behind opt in system property - #1550

Add support for Github stacked pull requests behind opt in system property#1550

juliovalcarcel wants to merge 3 commits into

jenkinsci:masterjenkinsci/github-branch-source-plugin:masterfrom

juliovalcarcel:fix/1545-prefer-github-merge-commitjuliovalcarcel/github-branch-source-plugin:fix/1545-prefer-github-merge-commitCopy head branch name to clipboard