Migrating the default branch of the wiki from `master` to `main` ?

Proposal

Context

Since 13.12, the default branch of repositories is called main. Users can change the default branch name of past repos from master to main. However, the default branch of the wiki can not be adapted.

Request

Enable users to rename the default branch of the wiki from master to main.

Proposition

In Settings > General > "Visibility, project features, permissions > Wiki", add a "default branch" field to rename the default name of the wiki.