[Rendering][XAML] ChoiceSets without a Label have no accessible name

Target Platforms

UWP

SDK Version

1.5

Application Name

Dev Home

Problem Description

If a Label (Header) is not specified on a ChoiceSet (ComboBox), the resulting ComboBox will not have an accessible name. This is the same behavior that happens in direct WinUI 3, however, setting an Accessible Name directly in WinUI 3 is a lot easier than hoping each Adaptive Card host creates a custom renderer for this case. I suggest that if there is no Label, the renderer sets the Name to be the placeholder text. That way the card author can still do things the default way (set a label/header) but the control is still accessible if they do not.

https://dev.azure.com/microsoft/OS/_workitems/edit/48294659
https://dev.azure.com/microsoft/OS/_workitems/edit/48181033

Screenshots

No response

Card JSON

{
    "type": "AdaptiveCard",
    "$schema": "http://adaptivecards.io/schemas/adaptive-card.json",
    "version": "1.5",
    "body": [
        {
            "type": "Input.ChoiceSet",
            "choices": [
                {
                    "title": "Choice 1",
                    "value": "Choice 1"
                },
                {
                    "title": "Choice 2",
                    "value": "Choice 2"
                }
            ],
            "placeholder": "Placeholder text"
        }
    ]
}

Sample Code Language

No response

Sample Code

No response

Start by locating the UWP XAML renderer for Input.ChoiceSet and reproduce the supplied Card JSON with no Label and a placeholder. Verify the resulting ComboBox receives an accessible name, while preserving the existing labeled behavior.