From: Yoichi NAKAYAMA <yoichi.nakayama@gmail.com>

When the user runs 'git worktree add ../foo-dir bar-topic' command
that does not exactly say which remote they want to work with, and
there is no local branch named bar-topic, we try to guess which remote
by passing bar-topic then create a new branch named bar-topic which
tracks the remote branch.

If there are multiple remotes that have branch named bar-topic, we
silently gave up, leaving the variable 'branch' intact.  Then we
entered the conditional clause 'if (!opts.orphan &&
!lookup_commit_reference_by_name(branch))' and triggered "invalid
reference" error.  This error message did not contain enough
information to resolve the issue where the remote could not be
guessed.

To improve the situation, we display a hint and a descriptive error
message and die immediately when multiple matching branches are found.

Signed-off-by: Yoichi NAKAYAMA <yoichi.nakayama@gmail.com>

Submitted-As: https://lore.kernel.org/git/pull.2197.v4.git.1786430155244.gitgitgadget@gmail.com
In-Reply-To: https://lore.kernel.org/git/pull.2197.git.1786177301832.gitgitgadget@gmail.com
In-Reply-To: https://lore.kernel.org/git/pull.2197.v2.git.1786374470383.gitgitgadget@gmail.com
In-Reply-To: https://lore.kernel.org/git/pull.2197.v3.git.1786395305884.gitgitgadget@gmail.com