TryGetFolderFromPathAsync blocks on network drives causing file picker queue buildup

[sinjunyoung]

Describe the bug

Reproduction:

1. Set SuggestedStartLocation to a network drive path
2. Open file picker → works
3. Close/cancel
4. Open file picker again → dialog doesn't appear
5. Keep trying → multiple dialogs appear at once later

Workaround: Don't use SuggestedStartLocation, let system remember last location

Environment:

• Avalonia
• Windows Desktop
• Network drive (UNC or mapped drive)

To Reproduce

1. Set SuggestedStartLocation to a network drive path
2. Open file picker → works
3. Close/cancel
4. Open file picker again → dialog doesn't appear
5. Keep trying → multiple dialogs appear at once later

Expected behavior

No response

Avalonia version

11.3.9 ~ 11.3.11

OS

Windows

Additional context

No response

[maxkatz6]

TryGetFolderFromPathAsync itself is sync, but all it does on Windows backend - it calls new DictionaryInfo()

[AuroraZiling]

I cant reproduce (from latest commit)

private async void TestClick(object? sender, RoutedEventArgs e)
{
    var provider = TopLevel.GetTopLevel(this)!.StorageProvider;
    var location = await provider.TryGetFolderFromPathAsync(@"\\192.168.31.10\share\Test");
    var options = new FilePickerOpenOptions
    {
        SuggestedStartLocation = location,
    };
    var files = await provider.OpenFilePickerAsync(options);
}