Fit: Ignore complex_state, if no complex function is selected; closes #144

src/gui_qt/fit/fitfunction.py

@@ -235,7 +235,19 @@ class QFunctionWidget(QtWidgets.QWidget, Ui_Form):
         return all_parameters
 
     def get_complex_state(self):
-        return self.complex_comboBox.currentIndex() if self.iscomplex else None
+        iscomplex = False
+        iterator = QtWidgets.QTreeWidgetItemIterator(self.functree)
+        while iterator.value():
+            item = iterator.value()
+            if item.checkState(0) != QtCore.Qt.CheckState.Unchecked:
+                f = self.functions[item.data(0, QtCore.Qt.UserRole)]
+                if hasattr(f, 'iscomplex') and f.iscomplex:
+                    iscomplex = True
+                    break
+
+            iterator += 1
+
+        return self.complex_comboBox.currentIndex() if iscomplex else None
 
     def set_complex_state(self, state):
         if state is not None: