#### Should be 

```
 patch = merge_repo.git.format_patch(default_options({stdout: true}), "origin/#{merge_request.target_branch}..source/#{merge_request.source_branch}")
```

instead of 

```
 patch = merge_repo.git.format_patch(default_options({stdout: true}), "origin/#{merge_request.target_branch}...source/#{merge_request.source_branch}")
```


### Same for non-forks

```ruby
patch = merge_repo.git.format_patch(default_options({stdout: true}), "#{merge_request.target_branch}..#{merge_request.source_branch}")
```

instead of 

```ruby
patch = merge_repo.git.format_patch(default_options({stdout: true}), "#{merge_request.target_branch}...#{merge_request.source_branch}")
```