fixed fit parameter ignore boundary problems; fixes #128

src/gui_qt/fit/fit_parameter.py

@@ -243,7 +243,7 @@ class QFitParameterWidget(QtWidgets.QWidget, Ui_FormFit):
                     else:
                         lb, ub = bds[i]
                         try:
-                            if not (lb < p_i < ub):
+                            if not ((lb < p_i < ub) or (not is_fixed[i])):
                                 raise ValueError(f'Parameter {g.name} is outside bounds ({lb}, {ub})')
                         except TypeError:
                             pass