IsVisible binding not showing items again if Shadow is set

[dan-matthews]

Description

A very, very strange bug! It always works correctly on Windows, but on Android there is a bug. In my app, the IsVisible for a button is set using binding (MVVM). Setting IsVisible false will always hide the button, but setting IsVisible true is NOT showing the button. However, I found that a styling for the Button was causing the issue. Specifically, the setter (in a Styles.xaml file) was as follows:

    <Setter Property="Shadow">
        <Shadow Brush="Black"
            Offset="4,4"
            Opacity="0.9" />
    </Setter>

When the setter is swapped for individual setters, the IsVisible works:

    <Setter Property="Shadow.Offset" Value="4,4"/>
    <Setter Property="Shadow.Opacity" Value="0.9"/>
    <Setter Property="Shadow.Brush" Value="Black"/>

For some reason, the 'nested' style setter for Shadow seems to be affecting the visibility toggle of the element, but only on Android.

Steps to Reproduce

1. Create a starter Maui app (XAML)
2. Add the following to the Button style in Styles.xaml

<Setter Property="Shadow"> <Shadow Brush="Black" Offset="4,4" Opacity="0.9" /> </Setter>

4. Add a button to the MainPage with IsVisible to a bound property initialized false
5. Toggle the bound property to true (e.g. via another button)

Expected: Button becomes visible
Actual: Button stays hidden

Link to public reproduction project repository

(https://github.com/dan-matthews/VisibleTest)

Version with bug

7.0.86

Last version that worked well

Unknown/Other

Affected platforms

Android

Affected platform versions

Android 11+

Did you find any workaround?

Use individual style setters for Shadow.

Relevant log output

No response

[ghost]

Hi @dan-matthews. 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.

[jsuarezruiz]

Cannot reproduce the issue on current main branch:

[dan-matthews]

Added a link to a repo.

[PureWeen]

Duplicate of #15826