Setting BackgroundColor to null does not actually changes BackgroundColor

[Jon2G]

Description

Probably root cause of #19576
Android/iOS
(Windows works fine)
If you set the BackgroundColor to null nothing will happen.

Steps to Reproduce

Simply try to change BackgroundColor of a Page to null by binding or directly

<ContentPage ... BackgroundColor="Gray"> ... </ContentPage>

public partial class MainPage : ContentPage
{
.....
	private void RestoreBackground()
	{
		this.BackgroundColor = null; // Color will remain gray
	}
.....
}

https://github.com/Jon2G/MAUI-BackgroundColorNull/raw/main/Capture.PNG

Link to public reproduction project repository

https://github.com/Jon2G/MAUI-BackgroundColorNull

Version with bug

8.0.40 SR5

Is this a regression from previous behavior?

Yes, this used to work in Xamarin.Forms

Last version that worked well

Unknown/Other

Affected platforms

iOS, Android

Affected platform versions

Android 33,34

Did you find any workaround?

If you set the BackgroundColor to transparent or any other it will work but its not optimal

Relevant log output

No response

[github-actions]

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[PureWeen]

@Jon2G what if you call "ClearValue" vs setting it to null?

[aheubusch]

If nothing has changed in the last 2 ish years then this is explicitly not supported. #1485 and #5317

[Jon2G]

@PureWeen calling "ClearValue" instead of setting property to null seems to work, i have updated the reproduction project.
https://github.com/Jon2G/MAUI-BackgroundColorNull

[Jon2G]

@PureWeen I'm afraid i find a case where "ClearValue" does not works.

If you define a Style for the View without setting a "default" backgroundColor it will fail to clear the value

<Style TargetType="Label"> <!-- If you define a Style for the View without setting a "default" backgroundColor it will fail to clear the value --> <!--<Setter Property="BackgroundColor" Value="Transparent" />--> <Setter Property="LineBreakMode" Value="WordWrap" /> </Style>

A simple label
<Label x:Name="labelTest" BackgroundColor="Gray" Text="This text should be visible" TextColor="Gray" />

Then try to remove gray background with:
labelTest.ClearValue(Label.BackgroundColorProperty); //this DON'T work

I have updated the reproduction project.
https://github.com/Jon2G/MAUI-BackgroundColorNull

[FreakyAli]

@PureWeen What do you recommend we do in the above mentioned case?