Fix a bug with conflicted speakers in the same rename

ui.py

@@ -138,7 +138,7 @@ def render_rename_sidebar(currFile, speakerNames, display_speaker_tokens, token_
 
     st.sidebar.text(" ")
 
-    # Build claimed set (display labels) from the data model
+    # Build claimed set (display labels) from the data model — one speaker per entry
     all_claimed = {
         raw_to_display.get(token, token)
         for entry in st.session_state.globalRenames
@@ -172,6 +172,14 @@ def render_rename_sidebar(currFile, speakerNames, display_speaker_tokens, token_
             args=(idx, token_display_map),
             label_visibility="collapsed",
         )
+        # Show error if two speakers from the same file are in this entry
+        files_in_entry = [token.split(": ", 1)[0] for token in entry["speakers"]]
+        for fname in set(files_in_entry):
+            if files_in_entry.count(fname) > 1:
+                st.sidebar.error(
+                    f"Conflicted name for two speakers in one same file. Please remove one speaker."
+                )
+                break
 
     st.sidebar.text_input(
         "Add rename", placeholder="e.g. John",