Fix component inputs editable after simulation

src/main/python/utils/Container.py

@@ -367,7 +367,7 @@ def try_get_other_node_from_line(ln, this_item):
                 # Lock all dock widgets to read-only on success
                 for dw in dock_widget_lst:
                     if hasattr(dw, 'set_read_only'):
-                        dw.set_read_only(True)
+                        dw.set_read_only(False)
             else:
                 self.signals.msg_signal.emit(
                     f"<span style='color:red'>[{self.current_time()}] Simulation <b>Failed.</b></span>"
@@ -425,9 +425,19 @@ def _populate_results(self):
             DockWidget.show_result(dock_widget_lst)
 
             # Re-apply read-only state because show_result recreates the input fields
+            # Keep recreated input fields editable after results are populated
             for dw in dock_widget_lst:
                 if hasattr(dw, 'set_read_only'):
-                    dw.set_read_only(True)
+                    dw.set_read_only(False)
+
+            # Preserve connection-based restrictions for MaterialStream
+            for it in self.graphics.scene.items():
+                if isinstance(it, NodeItem) and getattr(it, "type", "") == "MaterialStream":
+                    try:
+                        if len(it.input[0].in_lines) > 0:
+                            it.obj.disableInputDataTab(it.dock_widget)
+                    except Exception as e:
+                        print(f"[DEBUG] MaterialStream input state update failed: {e}")
 
             # Make all result table items non-editable
             for dw in dock_widget_lst:

tests/test_container.py

@@ -397,11 +397,11 @@ def test_partially_connected_mixer_warns(self):
         self.container.simulate("EQN")
         self.assertTrue(self.any_message_contains(f"Warning: {mixer.name} - Missing Socket Connection(s)."))
 
-    def test_success_sets_dock_widgets_read_only(self):
+    def test_success_keeps_dock_widgets_editable(self):
         dw = MagicMock()
         dock_widget_lst.append(dw)
         self.container.simulate("EQN")
-        dw.set_read_only.assert_called_with(True)
+        dw.set_read_only.assert_called_with(False)
 
     def test_failure_when_result_is_too_short(self):
         dw = MagicMock()
@@ -488,7 +488,7 @@ def test_results_are_shown_and_tables_made_read_only(self):
             self.container._populate_results()
 
         mock_show.assert_called_once_with(dock_widget_lst)
-        dock.set_read_only.assert_called_once_with(True)
+        dock.set_read_only.assert_called_once_with(False)
         for r in range(2):
             for c in range(2):
                 flags = table.item(r, c).flags()