NumberBox's SpinButtonPlacementMode="Compact" behaves like "Hidden"

[stanlrt]

Describe the bug

When I set the attribute to Compact, I expect the spin buttons to behave like WinUI's and as described here wpfui.lepo.co/api/Wpf.Ui.Controls.NumberBoxSpinButtonPlacementMode.html (i.e. horizontal placement when box isn't focused)

But they behave like Hidden (no spin button at all)

To Reproduce

Set the attribute and run the app.

Expected behavior

They behave as described

Screenshots

OS version

11

.NET version

10

WPF-UI NuGet version

4.2.0

Additional context

it seems #1022 fixes/implements the behaviour (although as a fully distinct new component/control, which isn't ideal)

[chucker]

Judging from the style, Compact flat out doesn't seem to be implemented.

[stanlrt]

I'll try and find the time to adapt @koal44's PR into a Compact implementation.

One thing to note is that it does not mimic WinUI's behaviour (buttons that become massive when the field is focused). Does WPF-UI have a policy to be as close to WinUI as possible, or is deviating ok?

[chucker]

IMHO, mimicking WinUI 3 is preferable where possible, but I will approve a PR if it implements the third enum value, even if it doesn't fully match behavior "yet", assuming the deviation is merely a question of extra effort.