ScrollView doesn't constrain itself to a VerticalStackLayout parent whereas it does when the parent is a Grid

[PureWeen]

Description

Given the following two setups it feels like the two ScrollViews should both size to a height of 100 but only the Grid does.

    <Grid RowDefinitions="Auto, Auto">
        <Grid HeightRequest="100">
            <ScrollView x:Name="gridScrollView" MinimumHeightRequest="100" SizeChanged="GridSizeChanged"  Background="Green">
                <VerticalStackLayout HeightRequest="250" Background="Blue">
                    <Label Text="Layout Height" x:Name="gridLabel"></Label>
                </VerticalStackLayout>
            </ScrollView>
        </Grid>
        <VerticalStackLayout HeightRequest="100" Grid.Row="1">
            <ScrollView x:Name="vslScrollView" MinimumHeightRequest="100" SizeChanged="VSLSizeChanged" Background="Purple">
                <VerticalStackLayout HeightRequest="250" Background="Orange">
                    <Label Text="Layout Height" x:Name="vslLabel"></Label>
                </VerticalStackLayout>
            </ScrollView>
        </VerticalStackLayout>
    </Grid>

The height of each layout is 100. If you set the VSL to clip it'll clip the ScrollView to 100.

Steps to Reproduce

Run the attached app

Link to public reproduction project repository

MauiApp81.zip

Version with bug

7.0 (current)

Last version that worked well

Unknown/Other

Affected platforms

iOS, Android, Windows, macOS

Affected platform versions

All of them

Did you find any workaround?

No response

Relevant log output

No response

[ghost]

We've moved this issue to the Backlog milestone. This means that it is not going to be worked on for the coming release. We will reassess the backlog following the current release and consider this item at that time. To learn more about our issue management process and to have better expectation regarding different types of issues you can read our Triage Process.

[hartez]

If you want the children of the VerticalStackLayout to be cut off at the height of the VSL, you need to set IsClippedToBounds to True:

<VerticalStackLayout HeightRequest="100" Grid.Row="1" IsClippedToBounds="True">

Note that the ScrollView will still be the height of its content (250) because the VerticalStackLayout doesn't impose any measurement height on it, so while it's visually clipped it still has laid out to a height of 250 with a viewport height of 250; the content won't scroll. The Grid in the first row does impose a height on its ScrollView, so the top ScrollView will scroll its content.