fix: Ensure Fluent resources for AutoSuggestBox on WASM

[mcNets]

GitHub Issue (If applicable): closes #

unoplatform/uno#15967

PR Type

What kind of change does this PR introduce?

Forces Fluent style on AutosuggestBox popup in Wasm.

• Bugfix

What is the current behavior?

Autosuggest box has Material styles applied.

What is the new behavior?

When the page loads gets the Border's popup control via GetTemplateChild and applies EnsureXamlControlsResources() method.

PR Checklist

Please check if your PR fulfills the following requirements:

• Tested on iOS.
• Tested on Wasm.
• Tested on Android.
• Tested on UWP.
• Tested in both Light and Dark themes.
• Associated with an issue (GitHub or internal)

Other information

I got the name of the Border from the microsoft repo.

https://github.com/microsoft/microsoft-ui-xaml/blob/d74a0332cf0d5e58f12eddce1070fa7a79b4c2db/src/controls/dev/AutoSuggestBox/AutoSuggestBoxHelper.cpp#L8-L13

Internal Issue (If applicable):
unoplatform/uno#15967

[morning4coffe-dev]

Thanks! I have tested this fix with multiple different platforms, and it all seems to work well now. It doesn't seem to crash on Windows on my side + this fix is not only for wasm, but for all platforms. We should also apply this fix for the main search as well:

[mcNets]

@morning4coffe-dev have a look, now it is applying Fluent to all AutosuggestBox

[morning4coffe-dev]

Thank you, @mcNets! Looks good. Could you check an error error CS7036: There is no argument given that corresponds to the required parameter 'childName' of 'ControlHelper.GetTemplateChild<TControl>(Control, Func<string, DependencyObject>, string)' on Windows after your last commit? There could be some clash between MUXC and Uno.Themes

[mcNets]

@morning4coffe-dev windows head works fine without ensuring xaml resources so I used a conditional. I don't know why Windows head is using the extension class in Uno.Themes instead of Control.GetTemplateChild in Microsoft.UI.Xaml.Controls.

https://github.com/unoplatform/Uno.Themes/blob/master/src/library/Uno.Themes/Helpers/ControlHelper.cs

[morning4coffe-dev]

No problem, I can confirm, this works well now. Only problem, I am seeing is the search popup is too wide, but that is a different issue:

[welcome]

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Merci beaucoup 👋

[morning4coffe-dev]

Thank you @mcNets again for helping on this and for your contribution!

[mcNets]

@morning4coffe-dev thank you for your help.