Fix insets on android 15

[emmauss]

What does the pull request do?

Disables updating any system bar properties when setting display edge to edge on Android 15. It is also not possible to change system bar color on android 15. This change only affects projects targeting net9 and above.

More information about the new behavior here #18835 .

What is the current behavior?

What is the updated/expected behavior with this PR?

How was the solution implemented (if it's not obvious)?

Checklist

• Added unit tests (if possible)?
• Added XML documentation to any related classes?
• Consider submitting a PR to https://github.com/AvaloniaUI/avalonia-docs with user documentation

Breaking changes

IInsetsManager has a new property DisplayEdgeToEdgePreference and DisplaysEdgeToEdge.

Obsoletions / Deprecations

IInsetsManager.DisplayEdgeToEdge is deprecated for IInsetsManager.DisplayEdgeToEdgePreference

Fixed issues

Fixes #18835

[avaloniaui-bot]

You can test this PR using the following package version. 12.0.999-cibuild0056468-alpha. (feed url: https://nuget-feed-all.avaloniaui.net/v3/index.json) [PRBUILDID]

[kekekeks]

Ignoring values in property setters is technically a huge hack since it breaks expectations about properties.

Consider changing IInsetsManager to reflect this.

• Add DisplayEdgeToEdgePreference property for setting application's preference
• Add read-only DisplaysEdgeToEdge property that reflects the actual value
• Mark the old DisplayEdgeToEdge property as obsolete, setter would control DisplayEdgeToEdgePreference, getter would read DisplaysEdgeToEdge
• (optional) Add SupportedEdgeToEdgeModes property

[emmauss]

@kekekeks SupportedEdgeToEdgeModes may not make much sense since at best, it's a on/off state, and at worst, apps are forced into one state permanently. Not a lot of choices to make here.

[emmauss]

Added DisplayEdgeToEdgePreference property and deprecated DisplayEdgeToEdge

[avaloniaui-bot]

You can test this PR using the following package version. 12.0.999-cibuild0056594-alpha. (feed url: https://nuget-feed-all.avaloniaui.net/v3/index.json) [PRBUILDID]

[maxkatz6]

@emmauss can we keep backport candidate label for 11.x? So we could remove old API in 12.0

[emmauss]

@emmauss can we keep backport candidate label for 11.x? So we could remove old API in 12.0

That would be ok.

[avaloniaui-bot]

You can test this PR using the following package version. 12.0.999-cibuild0056819-alpha. (feed url: https://nuget-feed-all.avaloniaui.net/v3/index.json) [PRBUILDID]