graphic helpers - 2.19 hotfix (#14425)

* 2.19 hotfix

- graphic scale units not taking effect in Dynamo - added check to disable host settings interfering with Dynamo settings
- renamed resource for Show Grid to Show Helpers

* revert menu item change

- revert menu item name change, will move it to Master instead

* line endings

* fix units overriding grid visibility

- setting scale units would override the visibility of the grid
- now checks the grid, and if disabled, toggles it back to the correct setting

src/DynamoCoreWpf/ViewModels/Menu/PreferencesViewModel.cs

@@ -17,7 +17,6 @@
 using Dynamo.Wpf.ViewModels.Core.Converters;
 using DynamoUtilities;
 using ViewModels.Core;
-using static Dynamo.Configuration.Configurations;
 using Res = Dynamo.Wpf.Properties.Resources;
 
 namespace Dynamo.ViewModels
@@ -195,7 +194,7 @@ public string SelectedUnits
                     selectedUnits = value;
                     RaisePropertyChanged(nameof(SelectedUnits));
 
-                    if (UseHostScaleUnits) return;
+                    if (UseHostScaleUnits && IsDynamoRevit) return;
 
                     var result = Enum.TryParse(selectedUnits, out Configurations.Units currentUnit);
                     if (!result) return;
@@ -206,6 +205,14 @@ public string SelectedUnits
                         preferenceSettings.GraphicScaleUnit = value;
                         preferenceSettings.GridScaleFactor = (float)units;
                         dynamoViewModel.UpdateGraphicHelpersScaleCommand.Execute(null);
+
+                        // We have turn the grid visilibilty on
+                        // Check the current visibility settings, and turn it back off 
+                        if (!preferenceSettings.IsBackgroundGridVisible)
+                        {
+                            dynamoViewModel.ToggleBackgroundGridVisibilityCommand.Execute(null);    // switch 'on'
+                            dynamoViewModel.ToggleBackgroundGridVisibilityCommand.Execute(null);    // switch 'off'
+                        }
                     }
                 }
             }