Expander with PageSlide transition broken

[aguahombre]

Describe the bug

Using an expander with PageSlide ContentTransition slides the content in the wrong direction when closing the expander.

It looks like commit f13ece4 removed the !forward on Expander.cs line 107

Before...
                if (IsExpanded)
                {
                    ContentTransition.Start(null, visualContent, forward);
                }
                else
                {
                    ContentTransition.Start(visualContent, null, !forward);
                }

After...
                if (IsExpanded)
                {
                    await ContentTransition.Start(null, visualContent, forward, _lastTransitionCts.Token);
                }
                else
                {
                    await ContentTransition.Start(visualContent, null, forward, _lastTransitionCts.Token);
                }

To Reproduce

    <Style Selector="Expander">
      <Setter Property="ContentTransition">
        <Setter.Value>
          <PageSlide Orientation="Horizontal" Duration="0:0:0.25"/>
        </Setter.Value>
      </Setter>
      <Setter Property="ExpandDirection" Value="Right"/>
   </Style>

Expected behavior

The expander content should slide right when opening the expander and back left when closing the expander.

Avalonia version

11.2

OS

Windows

Additional context

No response

[timunie]

@aguahombre yeah I think the ! Was removed by accident. Can you file a PR to add it back?

/cc @maxkatz6

[aguahombre]

If I get time next week, I can give the PR a go

[Coloryr]

Let me make one pr.