Add session state management for player selection in Handbuilder tab of app.py by introducing a unique key to reset selection upon player choice. This enhancement improves user experience by ensuring accurate player selection and preventing stale selections during interactions.

app.py

@@ -827,6 +827,8 @@ with tab4:
     # --- LINEUP STATE ---
     if 'handbuilder_lineup' not in st.session_state:
         st.session_state['handbuilder_lineup'] = pd.DataFrame(columns=['Player', 'Team', 'Salary', 'Median', 'Own%'])
+    if 'handbuilder_select_key' not in st.session_state:
+        st.session_state['handbuilder_select_key'] = 0
 
     col1, col2 = st.columns([1, 2])
     with col2:
@@ -834,10 +836,11 @@ with tab4:
         event = st.dataframe(
             player_select_df,
             on_select="rerun",
-            selection_mode=["single-row"]
+            selection_mode=["single-row"],
+            key=f"handbuilder_select_{st.session_state['handbuilder_select_key']}"
         )
 
-        # If a row is selected, add that player to the lineup
+        # If a row is selected, add that player to the lineup and reset selection
         if event and "rows" in event.selection and len(event.selection["rows"]) > 0:
             idx = event.selection["rows"][0]
             player_row = player_select_df.iloc[[idx]][['Player', 'Team', 'Salary', 'Median', 'Own%']]
@@ -847,7 +850,8 @@ with tab4:
                     [st.session_state['handbuilder_lineup'], player_row],
                     ignore_index=True
                 )
-            # Rerun to reset selection
+            # Change the key to reset the selection
+            st.session_state['handbuilder_select_key'] += 1
             st.rerun()
 
     with col1: