[Rendering] [WinUI3] Columns not are not vertically stretched in WinUI3

Target Platforms

UWP/WinUI3

SDK Version

Unknown, but probably latest released

Application Name

Widgets board (With new WinUI3 Adaptive Cards)

Problem Description

When using a ColumnSet with an specified minHeigh columns elements doesn't use all the space available. This behavior differs from other platforms such NodeJS.

Screenshots

This is how the card is rendered in the designer:

This is how the card is rendered in the widget board:

Card JSON

{
    "type": "AdaptiveCard",
    "$schema": "http://adaptivecards.io/schemas/adaptive-card.json",
    "version": "1.6",
    "body": [
        {
            "type": "ColumnSet",
            "minHeight": "50px",
            "columns": [
                {
                    "type": "Column",
                    "width": "stretch",
                    "backgroundImage": {
                        "url": "data:image/svg+xml;utf8,<svg xmlns=\"http://www.w3.org/2000/svg\"><rect width=\"100%\" height=\"100%\"/></svg>"
                    },
                    "items": [
                        {
                            "type": "TextBlock",
                            "text": "TextBlock",
                            "wrap": true,
                            "color": "Light"
                        }
                    ]
                }
            ]
        }
    ]
}

Sample Code Language

No response

Sample Code

No response

Start with the supplied Adaptive Card JSON and compare the WinUI3 widget-board rendering with the designer and NodeJS behavior. Trace the ColumnSet minHeight layout handling for WinUI3; done means the column content vertically stretches to use the available height.