some fixes again

python_app/gui/runtime/history.py

@@ -15,8 +15,8 @@ THistoryCollection = TypeVar("THistoryCollection", SweepCollection, ResultCollec
 def record_result_history(
     result_history: deque[ResultCollection],
     collection: ResultCollection,
-) -> bool:
-    """Append new result or replace existing entry by stable collection key."""
+) -> None:
+    """Append a new result, or replace the existing entry with the same stable key."""
     for index in range(len(result_history) - 1, -1, -1):
         existing = result_history[index]
         if (
@@ -24,10 +24,9 @@ def record_result_history(
             and existing.monotonic_ns == collection.monotonic_ns
         ):
             result_history[index] = collection
-            return True
+            return
 
     result_history.append(collection)
-    return True
 
 
 def remove_last_aligned_histories(