Fix IDE detecting MR from fork branch

**Why?**
Currently the IDE loads a merge request based on only the
`source_branch` name. This means it loads MR's from
forks that have the same branch name (not good).

- This required updating the BE API to accept `source_project_id`

1 files changed, 8 insertions, 0 deletions

diff --git a/spec/finders/merge_requests_finder_spec.rb b/spec/finders/merge_requests_finder_spec.rb
index 56136eb84bc..f508b9bdb6f 100644
--- a/spec/finders/merge_requests_finder_spec.rb
+++ b/spec/finders/merge_requests_finder_spec.rb
@@ -83,6 +83,14 @@ describe MergeRequestsFinder do
         expect(merge_requests).to contain_exactly(merge_request2)
       end
 
+      it 'filters by source project id' do
+        params = { source_project_id: merge_request2.source_project_id }
+
+        merge_requests = described_class.new(user, params).execute
+
+        expect(merge_requests).to contain_exactly(merge_request1, merge_request2, merge_request3)
+      end
+
       it 'filters by state' do
         params = { state: 'locked' }