Minor bug fix. When no next index, return "default value"

nicolaihenriksen · nicolaihenriksen · commit 960301a1f731 · 2026-03-31T11:48:53.000+02:00
diff --git a/src/MaterialDesignThemes.Wpf/Behaviors/Internal/TabControlHeaderScrollBehavior.cs b/src/MaterialDesignThemes.Wpf/Behaviors/Internal/TabControlHeaderScrollBehavior.cs
@@ -235,7 +235,7 @@ bool IsMovingForward()
 
         double GetItemOffset(int index)
         {
-            if (tabControl.ItemContainerGenerator.ContainerFromIndex(index) is not TabItem container)
+            if (index < 0 || tabControl.ItemContainerGenerator.ContainerFromIndex(index) is not TabItem container)
                 return 1;
             return container.TranslatePoint(new Point(), AssociatedObject).X;
         }

Original file line number	Diff line number	Diff line change
`@@ -235,7 +235,7 @@ bool IsMovingForward()`
`235`	`235`
`236`	`236`	`double GetItemOffset(int index)`
`237`	`237`	`{`
`238`		`- if (tabControl.ItemContainerGenerator.ContainerFromIndex(index) is not TabItem container)`
	`238`	`+ if (index < 0 \|\| tabControl.ItemContainerGenerator.ContainerFromIndex(index) is not TabItem container)`
`239`	`239`	`return 1;`
`240`	`240`	`return container.TranslatePoint(new Point(), AssociatedObject).X;`
`241`	`241`	`}`