Fix System.InvalidCastException in PageNavigationHost

[emmauss]

What does the pull request do?

This PR fixes an System.InvalidCastException that occurs when using PageNavigationHost.

What is the current behavior?

App crashes with the following exception, using the ControlCatalog sample.

11:45:56:395	04-10 11:46:01.422 E/AndroidRuntime( 4826): android.runtime.JavaProxyThrowable: [System.InvalidCastException]: Specified cast is not valid.
11:45:56:395	04-10 11:46:01.422 E/AndroidRuntime( 4826): 	at Avalonia.AvaloniaPropertyChangedExtensions.GetOldValue(D:\ryujinx\Avalonia\src\Avalonia.Base\AvaloniaPropertyChangedExtensions.cs:16)
11:45:56:395	04-10 11:46:01.422 E/AndroidRuntime( 4826): 	at Avalonia.Controls.PageNavigationHost.ContentPresenter_PropertyChanged(D:\ryujinx\Avalonia\src\Avalonia.Controls\Page\PageNavigationHost.cs:135)
11:45:56:395	04-10 11:46:01.422 E/AndroidRuntime( 4826): 	at Unknown.Unknown(Unknown Source)
11:45:56:395	04-10 11:46:01.422 E/AndroidRuntime( 4826): 	at Avalonia.AvaloniaObject.RaisePropertyChanged(D:\ryujinx\Avalonia\src\Avalonia.Base\AvaloniaObject.cs:803)
11:45:56:395	04-10 11:46:01.422 E/AndroidRuntime( 4826): 	at Avalonia.AvaloniaObject.SetAndRaise(D:\ryujinx\Avalonia\src\Avalonia.Base\AvaloniaObject.cs:830)
11:45:56:395	04-10 11:46:01.422 E/AndroidRuntime( 4826): 	at Avalonia.Controls.Presenters.ContentPresenter.set_Child(D:\ryujinx\Avalonia\src\Avalonia.Controls\Presenters\ContentPresenter.cs:361)
11:45:56:395	04-10 11:46:01.422 E/AndroidRuntime( 4826): 	at Avalonia.Controls.Presenters.ContentPresenter.UpdateChild(D:\ryujinx\Avalonia\src\Avalonia.Controls\Presenters\ContentPresenter.cs:550)
11:45:56:395	04-10 11:46:01.422 E/AndroidRuntime( 4826): 	at Avalonia.Controls.Presenters.ContentPresenter.UpdateChild(D:\ryujinx\Avalonia\src\Avalonia.Controls\Presenters\ContentPresenter.cs:499)
11:45:56:395	04-10 11:46:01.422 E/AndroidRuntime( 4826): 	at Avalonia.Controls.Presenters.ContentPresenter.ApplyTemplate(D:\ryujinx\Avalonia\src\Avalonia.Controls\Presenters\ContentPresenter.cs:462)
11:45:56:395	04-10 11:46:01.422 E/AndroidRuntime( 4826): 	at Avalonia.Layout.Layoutable.MeasureCore(D:\ryujinx\Avalonia\src\Avalonia.Base\Layout\Layoutable.cs:559)
11:45:56:395	04-10 11:46:01.422 E/AndroidRuntime( 4826): 	at Avalonia.Layout.Layoutable.Measure(D:\ryujinx\Avalonia\src\Avalonia.Base\Layout\Layoutable.cs:387)
11:45:56:395	04-10 11:46:01.422 E/AndroidRuntime( 4826): 	at Avalonia.Layout.Layoutable.MeasureOverride(D:\ryujinx\Avalonia\src\Avalonia.Base\Layout\Layoutable.cs:647)
11:45:56:395	04-10 11:46:01.422 E/AndroidRuntime( 4826): 	at Avalonia.Layout.Layoutable.MeasureCore(D:\ryujinx\Avalonia\src\Avalonia.Base\Layout\Layoutable.cs:577)
11:45:56:395	04-10 11:46:01.422 E/AndroidRuntime( 4826): 	at Avalonia.Layout.Layoutable.Measure(D:\ryujinx\Avalonia\src\Avalonia.Base\Layout\Layoutable.cs:387)
11:45:56:395	04-10 11:46:01.422 E/AndroidRuntime( 4826): 	at Avalonia.Layout.LayoutHelper.MeasureChild(D:\ryujinx\Avalonia\src\Avalonia.Base\Layout\LayoutHelper.cs:48)
11:45:56:395	04-10 11:46:01.422 E/AndroidRuntime( 4826): 	at Avalonia.Controls.Presenters.ContentPresenter.MeasureOverride(D:\ryujinx\Avalonia\src\Avalonia.Controls\Presenters\ContentPresenter.cs:663)
11:45:56:395	04-10 11:46:01.422 E/AndroidRuntime( 4826): 	at Avalonia.Layout.Layoutable.MeasureCore(D:\ryujinx\Avalonia\src\Avalonia.Base\Layout\Layoutable.cs:577)
11:45:56:395	04-10 11:46:01.422 E/AndroidRuntime( 4826): 	at Avalonia.Layout.Layoutable.Measure(D:\ryujinx\Avalonia\src\Avalonia.Base\Layout\Layoutable.cs:387)
11:45:56:395	04-10 11:46:01.422 E/AndroidRuntime( 4826): 	at Avalonia.Layout.LayoutManager.Measure(D:\ryujinx\Avalonia\src\Avalonia.Base\Layout\LayoutManager.cs:312)
11:45:56:395	04-10 11:46:01.422 E/AndroidRuntime( 4826): 	at Avalonia.Layout.LayoutManager.ExecuteMeasurePass(D:\ryujinx\Avalonia\src\Avalonia.Base\Layout\LayoutManager.cs:260)
11:45:56:395	04-10 11:46:01.422 E/AndroidRuntime( 4826): 	at Avalonia.Layout.LayoutManager.InnerLayoutPass(D:\ryujinx\Avalonia\src\Avalonia.Base\Layout\LayoutManager.cs:241)
11:45:56:395	04-10 11:46:01.422 E/AndroidRuntime( 4826): 	at Avalonia.Layout.LayoutManager.ExecuteLayoutPass(D:\ryujinx\Avalonia\src\Avalonia.Base\Layout\LayoutManager.cs:152)
11:45:56:395	04-10 11:46:01.422 E/AndroidRuntime( 4826): 	at Avalonia.Controls.TopLevel.HandleResized(D:\ryujinx\Avalonia\src\Avalonia.Controls\TopLevel.cs:701)
11:45:56:395	04-10 11:46:01.422 E/AndroidRuntime( 4826): 	at Avalonia.Android.Platform.SkiaPlatform.TopLevelImpl.Resize(D:\ryujinx\Avalonia\src\Android\Avalonia.Android\Platform\SkiaPlatform\TopLevelImpl.cs:140)
11:45:56:395	04-10 11:46:01.422 E/AndroidRuntime( 4826): 	at Avalonia.Android.AvaloniaActivity+GlobalLayoutListener.OnGlobalLayout(D:\ryujinx\Avalonia\src\Android\Avalonia.Android\AvaloniaActivity.cs:253)

What is the updated/expected behavior with this PR?

How was the solution implemented (if it's not obvious)?

Checklist

• Added unit tests (if possible)?
• Added XML documentation to any related classes?
• Consider submitting a PR to https://github.com/AvaloniaUI/avalonia-docs with user documentation

Breaking changes

Obsoletions / Deprecations

Fixed issues

[avaloniaui-bot]

You can test this PR using the following package version. 12.1.999-cibuild0064718-alpha. (feed url: https://nuget-feed-all.avaloniaui.net/v3/index.json) [PRBUILDID]

[avaloniaui-bot]

You can test this PR using the following package version. 12.1.999-cibuild0064720-alpha. (feed url: https://nuget-feed-all.avaloniaui.net/v3/index.json) [PRBUILDID]