Added adjustable MinScale property to ZoomPanel

inabox.wpf/Forms/ZoomPanel/ZoomPanel.xaml.cs

@@ -35,6 +35,21 @@ public partial class ZoomPanel : ContentControl, INotifyPropertyChanged
         }
     }
 
+    public double _minScale = 0.5;
+    public double MinScale
+    {
+        get => _minScale;
+        set
+        {
+            _minScale = value;
+            if(_scale < _minScale)
+            {
+                Scale = _minScale;
+            }
+        }
+    }
+
+
     public double _scale = 1;
     public double Scale
     {
@@ -149,7 +164,7 @@ public partial class ZoomPanel : ContentControl, INotifyPropertyChanged
                 Scale /= 1 + (-e.Delta) * WheelSpeed;
             }
 
-            Scale = Math.Max(Scale, 0.5);
+            Scale = Math.Max(MinScale, Scale);
 
             var scaledPos = new Point(contentMPos.X * Scale, contentMPos.Y * Scale);
             var offset = scaledPos - pos;