Toplevel - Fix system theme not being applied at launch on some platforms

[emmauss]

What does the pull request do?

Platform Binding of ActualThemeVariantProperty is moved from WindowBase up to TopLevel, thus setting it for all supported platforms.

On Android, remove the visibility check when setting system bar theme, so it's now always set. I haven't noticed any adverse side effects of this change,

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

Obsoletions / Deprecations

Fixed issues

Fixes #16065

[avaloniaui-bot]

You can test this PR using the following package version. 11.2.999-cibuild0049623-alpha. (feed url: https://nuget-feed-all.avaloniaui.net/v3/index.json) [PRBUILDID]

[kerams]

I suspect this broke on the fly theme switching (i.e. automatic reaction to a theme switch via the system bar) for me on Android. 11.2.999-cibuild0049474-alpha from the 26th works fine, 11.2.999-cibuild0049782-alpha from today doesn't.

[emmauss]

I suspect this broke on the fly theme switching (i.e. automatic reaction to a theme switch via the system bar) for me on Android. 11.2.999-cibuild0049474-alpha from the 26th works fine, 11.2.999-cibuild0049782-alpha from today doesn't.

Are you detecting the system theme using the status bar and then applying your theme? There's already a better way of detecting system theme changes.

[kerams]

No, I am using Material.Styles and not explicitly handling configuration changes. With 11.2.999-cibuild0049474-alpha, if I change the system theme from the status bar on top, my application theme automatically changes too. It no longer does in 11.2.999-cibuild0049782-alpha.

[emmauss]

No, I am using Material.Styles and not explicitly handling configuration changes. With 11.2.999-cibuild0049474-alpha, if I change the system theme from the status bar on top, my application theme automatically changes too. It no longer does in 11.2.999-cibuild0049782-alpha.

Could you create an issue with a repro for me to look at?