Added notification icon in recomended mode. The notification icon is only

active if one of custom settings is changed
CURA-4333

cura/CuraApplication.py

@@ -400,6 +400,8 @@ class CuraApplication(QtApplication):
             # ALWAYS ask whether to keep or discard the profile
             self.showDiscardOrKeepProfileChanges.emit()
 
+    sidebarSimpleDiscardOrKeepProfileChanges = pyqtSignal()
+
     @pyqtSlot(str)
     def discardOrKeepProfileChangesClosed(self, option):
         if option == "discard":
@@ -409,6 +411,10 @@ class CuraApplication(QtApplication):
 
             global_stack.getTop().clear()
 
+            #event handler for SidebarSimple, which will update sliders view visibility (like:sliders..)
+            if Preferences.getInstance().getValue("cura/active_mode") == 0:
+                self.sidebarSimpleDiscardOrKeepProfileChanges.emit()
+
     @pyqtSlot(int)
     def messageBoxClosed(self, button):
         if self._message_box_callback:

cura/Settings/MachineManager.py

@@ -413,6 +413,42 @@ class MachineManager(QObject):
 
         return False
 
+    ## Check whether user containers have adjusted settings or not
+    #   \param skip_keys \type{list} List of setting keys which will be not taken into account ("support_enable" , "infill_sparse_density"...)
+    #   \return \type{boole} Return true if user containers have any of adjusted settings
+    @pyqtSlot("QVariantList", result = bool)
+    def hasUserCustomSettings(self, skip_keys = []) -> bool:
+
+        user_setting_keys = []
+        try:
+            if not self._global_container_stack:
+                return False
+
+            allContainers = self._global_container_stack.getContainers()
+
+            for container in allContainers:
+                meta = container.getMetaData()
+                if meta and meta["type"] and meta["type"] == "user":
+                    user_setting_keys.extend(container.getAllKeys())
+
+            stacks = list(ExtruderManager.getInstance().getMachineExtruders(self._global_container_stack.getId()))
+            for stack in stacks:
+
+                for container in stack.getContainers():
+                    meta = container.getMetaData()
+                    if meta and meta["type"] and meta["type"] == "user":
+                        user_setting_keys.extend(container.getAllKeys())
+
+            for skip_key in skip_keys:
+                if skip_key in user_setting_keys:
+                    user_setting_keys.remove(skip_key)
+
+        except:
+            Logger.log("e", "While checking user custom settings occured error. skip_keys: %s", skip_keys )
+            return False
+
+        return len(user_setting_keys) > 0
+
     @pyqtProperty(int, notify = activeStackValueChanged)
     def numUserSettings(self) -> int:
         if not self._global_container_stack: