Entry background not accurate when changed with Triggers

[nogginbox]

Description

See @Redth comment below

I had a data trigger in my app that I couldn't get working in a DataTemplate. I decided to check I understood triggers by following the examples in the Maui Documentation.

The very first example did not work in Windows or Android. This was a simple example with an entry that should have turned yellow when it got focus. There was no visual change when it received focus.

Steps to Reproduce

1. In a new project add the following XAML code to a view (this code is taken directly from the docs):

<Entry Placeholder="Enter name">
    <Entry.Triggers>
        <Trigger TargetType="Entry"
                 Property="IsFocused"
                 Value="True">
            <Setter Property="BackgroundColor"
                    Value="Yellow" />
            <!-- Multiple Setter elements are allowed -->
        </Trigger>
    </Entry.Triggers>
</Entry>

2. Run the project and navigate to the page with the entry on.
3. Focus on the entry.
4. It does not turn yellow.

Version with bug

Preview 13 (current)

Last version that worked well

Unknown/Other

Affected platforms

Android, Windows

Affected platform versions

NA

Did you find any workaround?

No response

Relevant log output

No response

[Amir-Care]

Verified repro with VS Version 17.2.0 Preview 2.0 [32219.17.main] on Windows and Android.
Sample project : #5084.zip

[Redth]

I tested this a bit more and found that on Android now things seem to be working as expected.

On Windows, the Entry is not changing out properties correctly, but a Button is.

[Redth]

Tracked this one down a bit further.

The triggers are actually working ok, however setting the background color on the Entry is not working correctly. It seems to work better if we add the textBox.Background = brush; here however it's not working correctly on focus/hover in those cases.

It's like switching out the resources is not properly updating the platform control.

[StephaneDelcroix]

@Redth could you rephrase the original issue according to your findings ?