ItemsRepeater does not respect control alignment

[grokys]

ItemsRepeater does not currently respect the HorizontalAlignment/VerticalAlignment of child controls.

This seems to work on UWP so there's something up with our port.

[grokys]

This does actually seem to work correctly when the ItemsRepeater is not contained within a ScrollViewer which has horizontal scrolling enabled (as in ControlCatalog). I do however think it could handle this a bit better, need to double check with UWP and raise an issue there if necessary.

[lostmsu]

@grokys I recently stumbled upon ItemRepeater not honoring HorizontalAlignment. To my surprise, ListBox does o-O

<StackPanel
            Orientation="Vertical"
            VerticalAlignment="Center" HorizontalAlignment="Center"
            >
  <ItemsRepeater Items="{Binding RecentDirectories, ElementName=Root, Mode=OneWay}"
                 HorizontalAlignment="Center"
                 >
    <ItemsRepeater.ItemTemplate>
      <DataTemplate>
        <Button Content="{Binding Name, Mode=OneWay}"
                Command="{Binding OpenFolderCommand, ElementName=Root, Mode=OneTime}"
                CommandParameter="{Binding FullPath, Mode=OneWay}"
                CornerRadius="0"
                />
      </DataTemplate>
    </ItemsRepeater.ItemTemplate>
  </ItemsRepeater>

  <Button ... />
</StackPanel>

With ItemsRepeater (e.g. above XAML):

If I replace ItemsRepeater with ListBox in the above:

Avalonia 0.10.18 on Windows