- installed an eventFilter for the Sliders in the Preferences tab such that only if a slider has focus the mouse wheel will change its value

- in Preferences made sure that the changes of the scrollbar no longer interfere with signalling changes

appGUI/GUIElements.py

@@ -1075,6 +1075,7 @@ class FCSliderWithSpinner(QtWidgets.QFrame):
         self.spinner.valueChanged.connect(self._on_spinner)
 
         self.valueChanged = self.spinner.valueChanged
+        self.slider.installEventFilter(self)
 
     def get_value(self) -> int:
         return self.spinner.get_value()
@@ -1090,6 +1091,12 @@ class FCSliderWithSpinner(QtWidgets.QFrame):
         slider_value = self.slider.value()
         self.spinner.set_value(slider_value)
 
+    def eventFilter(self, object, event):
+        if event.type() == QtCore.QEvent.Type.Wheel:
+            if not self.slider.hasFocus():
+                return True
+        return False
+
 
 class FCSpinner(QtWidgets.QSpinBox):
     returnPressed = QtCore.pyqtSignal()