fix: LineNumberMargin did not recalculate required size after data context changed

Author: love-linger

src/Views/TextDiffView.axaml.cs

@@ -85,6 +85,12 @@ protected override Size MeasureOverride(Size availableSize)
                 }
             }
 
+            protected override void OnDataContextChanged(EventArgs e)
+            {
+                base.OnDataContextChanged(e);
+                InvalidateMeasure();
+            }
+
             private readonly CombinedTextDiffPresenter _editor;
             private readonly bool _isOldLine;
         }
@@ -458,6 +464,12 @@ protected override Size MeasureOverride(Size availableSize)
                 }
             }
 
+            protected override void OnDataContextChanged(EventArgs e)
+            {
+                base.OnDataContextChanged(e);
+                InvalidateMeasure();
+            }
+
             private readonly SingleSideTextDiffPresenter _editor;
         }