[regression/7.0.49] LinearGradientBrush not working on Android in Landscape orientation

[MAUIoxo]

Description

In .NET MAUI (Visual Studio 2022 - Version 17.6.5) a LinearGradientBrush is not calculated correctly or calculated at all under Android when Starting in Portrait orientation and switching to Landscape orientation.

The entire scenario including screenshots was discussed on Stackoverflow
https://stackoverflow.com/questions/76762039/lineargradientbrush-not-working-on-android-in-landscape-view

When starting in Portrait orientation and switching to Landscape orientation the LinearGradientBrush gets cut off at the bottom and is not calculated under Android. On iOS it seems to work perfectly (see Screenshots and comments in link above)

Steps to Reproduce

Create a ContentView with a Grid, BackgroundImage and LinearGradientBrush like this. It does not make a difference if using a ScrollView or a Grid inside:

<!-- BackgroundImage and LinearGradient -->
<Image x:Name="BackgroundImage" Grid.Row="0" Source="radiant_gradient.png" Aspect="AspectFill"/>
<ScrollView Grid.Row="0">
    <ScrollView.Background>
        <LinearGradientBrush EndPoint="0,1">
            <GradientStop Color="Transparent" Offset="0.1" />
            <GradientStop Color="White" Offset="1.0" />
        </LinearGradientBrush>
    </ScrollView.Background>
</ScrollView>

<ScrollView x:Name="ScrollView" Grid.Row="0" Grid.RowSpan="2" VerticalScrollBarVisibility="Always" BackgroundColor="Transparent" VerticalOptions="StartAndExpand">

</ScrollView

In Code-Behind "OnSizeAllocated(..)" the size of the BackgroundImage is scaled like this:

protected override void OnSizeAllocated(double width, double height)
{
    base.OnSizeAllocated(width, height);

    if (height > 0)
    {
        BackgroundImage.HeightRequest = height * 0.7;
    }
}

The idea of this is that we have a BackgroundImage and on top of it a nice looking gradient which fades out to the bottom. This should be realized in Portrait orientation (what it does) as well as in Landscape orientation.

In LandscapeOrientation just on Android (not on iOS) the LinearGradient seems to be cut off when starting in Portrait orientation and switching to Landscape orientation

Link to public reproduction project repository

https://github.com/MAUIoxo/LinearGradient_16392
https://stackoverflow.com/questions/76762039/lineargradientbrush-not-working-on-android-in-landscape-view

Version with bug

7.0.49

Last version that worked well

6.0

Affected platforms

Android

Affected platform versions

.NET MAUI with Google Pixel 5 - API 33 (Android 13.0 - API 33) emulator

Did you find any workaround?

No workaround to get the LinearGradientBrush calculated

Relevant log output

No response

[jsuarezruiz]

Could you attach a repro sample?. Have done a quick test with gradients and getting the sizes etc. Cannot see a wrong sizing.

Hi @MAUIoxo. We have added the "s/needs-repro" label to this issue, which indicates that we require steps and sample code to reproduce the issue before we can take further action. Please try to create a minimal sample project/solution or code samples which reproduce the issue, ideally as a GitHub repo that we can clone. See more details about creating repros here: https://github.com/dotnet/maui/blob/main/.github/repro.md

This issue will be closed automatically in 7 days if we do not hear back from you by then - please feel free to re-open it if you come back to this issue after that time.

This issue has been automatically marked as stale because it has been marked as requiring author feedback to reproduce the issue but has not had any activity for 4 days. It will be closed if no further activity occurs within 3 days of this comment. If it is closed, feel free to comment when you are able to provide the additional information and we will re-investigate.