Issue warning if remaining branch with a remote tracking branch.

CHANGELOG.md

@@ -14,6 +14,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * New `jj op abandon` command is added to clean up the operation history. If GC
   is implemented, Git refs and commit objects can be compacted.
 
+* `jj branch rename` will now warn if the renamed branch has a remote branch, since
+  those will have to be manually renamed outside of `jj`.
+
 ### Fixed bugs
 
 

cli/src/commands/branch.rs

@@ -350,6 +350,20 @@ fn cmd_branch_rename(
         return Err(user_error(format!("Branch already exists: {new_branch}")));
     }
 
+    if view
+        .remote_branches_matching(
+            &StringPattern::exact(old_branch),
+            &StringPattern::everything(),
+        )
+        .any(|(_, remote_ref)| remote_ref.is_tracking())
+    {
+        writeln!(
+            ui.warning(),
+            "warning: Branch: {}, has remote branches which will not be renamed",
+            old_branch
+        )?;
+    }
+
     let mut tx = workspace_command.start_transaction();
     tx.mut_repo()
         .set_local_branch_target(new_branch, ref_target);
@@ -363,6 +377,7 @@ fn cmd_branch_rename(
             make_branch_term(&[new_branch]),
         ),
     )?;
+
     Ok(())
 }