push: respect branch.*.merge ref, if specified

Author: vlad-anger

asyncgit/src/sync/remotes/push.rs

@@ -4,6 +4,7 @@ use crate::{
 	sync::{
 		branch::branch_set_upstream_after_push,
 		cred::BasicAuthCredential,
+		get_branch_upstream_merge,
 		remotes::{proxy_auto, Callbacks},
 		repository::repo,
 		CommitId, RepoPath,
@@ -163,9 +164,19 @@ pub fn push_raw(
 		PushType::Tag => "tags",
 	};
 
-	let branch_name =
+	let mut push_ref =
 		format!("{branch_modifier}refs/{ref_type}/{branch}");
-	remote.push(&[branch_name.as_str()], Some(&mut options))?;
+
+	if !delete {
+		if let Ok(Some(branch_upstream_merge)) =
+			get_branch_upstream_merge(repo_path, branch)
+		{
+			push_ref.push_str(&format!(":{branch_upstream_merge}"));
+		}
+	}
+
+	log::debug!("push to: {push_ref}");
+	remote.push(&[push_ref], Some(&mut options))?;
 
 	if let Some((reference, msg)) =
 		callbacks.get_stats()?.push_rejected_msg