Issue on MacOS with Window at start of app

[ia-alpatov]

Hello.

I have 2 issues on MacOS with Window at start of app:

1. It start not at center of screen with WindowStartupLocation="CenterScreen"
2. I see red rectangle on the Window place for 0.5 seconds when app starts.

Avalonia: 0.9.6

OS: macOS Catalina 10.15.3
Hardware: MacBook Pro (15-inch, 2019)
Processor: 2,6 GHz 6-Core Intel Core i7
Graphics:Radeon Pro 555X 4 GB; Intel UHD Graphics 630 1536 MB

I had tested this app on another MacBook with same result.

Config of AppBuilder:

    public static AppBuilder BuildAvaloniaApp()
    {
        return AppBuilder.Configure<App>()
            .UsePlatformDetect()
            .LogToDebug()
            .UseSkia()
            .UseReactiveUI();
    }

[danwalmsley]

@oiuldashov any chance of a minimal repro we can debug?

[mat1jaczyyy]

I also get red rectangle over at mat1jaczyyy/apollo-studio

[ia-alpatov]

@danwalmsley https://github.com/oiuldashov/avalonia_red_rectangle_issue

[Enoq00]

Hi all. i had same issue on macOS Catalina. Any news???

[maxkatz6]

Red flickering was fixed #6250