Header removals wait for the code editor to be left: autosave saves with drop=false, so follow_header adds and renames from the header but keeps a port or setting whose parameter is gone, and leaving the editor (blur or closing the panel) saves once more with removals; source saves of a flow run one at a time

backend/tests/api/routes/test_flows.py

@@ -580,6 +580,13 @@ def test_saving_a_header_moves_the_node_ports_in_the_draft(
     assert response["version"] == saved["definition"]["version"] + 1
     logger = next(n for n in draft["definition"]["nodes"] if n["id"] == "logger")
     assert logger["params"] == {"gain": 2}
+    # The editor's autosave: a parameter typed away keeps its port for now.
+    paused = client.put(
+        f"{PREFIX}/header/nodes/logger/source?drop=false",
+        headers=superuser_token_headers,
+        json={"code": "def process(reading, gain=2):\n    return {}\n"},
+    ).json()
+    assert paused["node"] is None
 
     client.delete(f"{PREFIX}/header", headers=superuser_token_headers)