Ensure valid index before calculating offset.

6 years ago · d5224d4bb0
1 changed files with 1 additions and 1 deletions
--- a/src/Avalonia.Layout/StackLayout.cs
+++ b/src/Avalonia.Layout/StackLayout.cs
@ -249,8 +249,8 @@ namespace Avalonia.Layout
                    realizationWindowOffsetInExtent + _orientation.MajorSize(realizationRect) >= 0 && realizationWindowOffsetInExtent <= majorSize)
                {
                    anchorIndex = (int) (realizationWindowOffsetInExtent / averageElementSize);
-                    offset = anchorIndex* averageElementSize + _orientation.MajorStart(lastExtent);
                    anchorIndex = Math.Max(0, Math.Min(itemsCount - 1, anchorIndex));
+                    offset = anchorIndex* averageElementSize + _orientation.MajorStart(lastExtent);
                }
        }