[OSX] Fixed multi-window freeze on Show when another window is rendering
[OSX] Fixed multi-window freeze on Show when another window is rendering

AvaloniaUI/Avalonia,AvaloniaUI/Avalonia,AvaloniaUI/Avalonia,AvaloniaUI/Avalonia,AvaloniaUI/Avalonia,AvaloniaUI/Avalonia,AvaloniaUI/Avalonia