Adjust t5515 for the upcoming change of the default branch name#761

dscho wants to merge 4 commits into

gitgitgadget:js/default-branch-name-adjust-t5411gitgitgadget/git:js/default-branch-name-adjust-t5411from

dscho:prepare-for-main-branch-t5515dscho/git:prepare-for-main-branch-t5515Copy head branch name to clipboard