Merge branch 'main' into fit_constraints

# Conflicts:
#	src/gui_qt/fit/fit_forms.py
#	src/gui_qt/main/management.py
#	src/nmreval/fit/minimizer.py

src/gui_qt/fit/fit_parameter.py

@@ -78,6 +78,7 @@ class QFitParameterWidget(QtWidgets.QWidget, Ui_FormFit):
             widgt.state_changed.connect(self.make_global)
             widgt.value_requested.connect(self.look_for_value)
             widgt.value_changed.connect(self.change_global_parameter)
+            widgt.replace_single_value.connect(self.delete_single_parameter)
 
             self.global_parameter.append(widgt)
             self.scrollwidget.layout().addWidget(widgt)
@@ -150,6 +151,13 @@ class QFitParameterWidget(QtWidgets.QWidget, Ui_FormFit):
         if value is None:
             self.change_data(self.comboBox.currentIndex())
 
+    def delete_single_parameter(self):
+        idx = self.global_parameter.index(self.sender())
+        for i in range(self.comboBox.count()):
+            set_id = self.comboBox.itemData(i)
+            self.data_values[set_id][idx] = None
+        self.change_data(self.comboBox.currentIndex())
+
     def change_single_choice(self, _, value, sender=None):
         if sender is None:
             sender = self.sender()
@@ -298,7 +306,8 @@ class ParameterSingleWidget(QtWidgets.QWidget):
 
         self._name = name
         self.label.setText(convert(name))
-        self.label.setToolTip('IIf this is bold then this parameter is only for this data. otherwise the general parameter is used and displayed')
+        self.label.setToolTip('If this is bold then this parameter is only for this data. '
+                              'Otherwise, the general parameter is used and displayed')
 
         # self.value_line.setValidator(QtGui.QDoubleValidator())
         self.value_line.textChanged.connect(lambda: self.valueChanged.emit(self.value) if self.value is not None else 0)