- Added an extra new line to the prepend of the Close message

Fixes #21710

If `git gc` runs and `Repository` has an instance to `Rugged::Repository`, a
bug in libgit2 may cause the instance to return a stale value or a missing
branch. This change not only optimizes the branch lookup so we don't have
to iterate through every branch, but it also works around the `git gc`
issue by forcing a repository reload every time `Repository#find_branch`
is called.

See: https://github.com/libgit2/libgit2/issues/1534

Closes #15392, #21470

Fixes #20456.

Closes #15552

Only visible when scrollable area is larger than height

- This would allow anyone with a personal access token (even a read-only
  token, once scopes are implemented) to escalate their access by
  obtaining the private token.

re a conversation with @rspeicher, this spec isn't really testing
anything.

adds test to check whether or not an email is sent to label subscribers after creating a new issue through the api

Add test for closed MR without fork

Add view test visibility of Reopen and Close buttons

Fix controller tests and validation method

Fix missing space

Remove unused variables from test

closed_without_fork? method refactoring

Add information about missing fork

When closed MR without fork can't edit target branch

Tests for closed MR edit view

Fix indentation and rebase, refactoring

Forks may not be up-to-date with the target project, and so might not
contain one of the parent refs in their repo. Fetch this if it isn't
present.

Closes #21139