histogram implemented

Plugins/LindtLeerformPlugin/Views/CellHistogramWindow.axaml.cs

@@ -1,4 +1,5 @@
 using Avalonia.Controls;
+using LindtLeerformPlugin.ViewModels;
 
 namespace LindtLeerformPlugin.Views;
 
@@ -7,5 +8,7 @@ public partial class CellHistogramWindow : Window
     public CellHistogramWindow()
     {
         InitializeComponent();
+        Editor.SplineDragCompleted += (_, _) =>
+            (DataContext as CellHistogramViewModel)?.RaiseDragCompleted();
     }
 }