[Rendering] Adaptive card with svg background looks great on web; bad in the new winui3 widget board

[davesmits]

Target Platforms

Other

SDK Version

Windows Widget Board; no idea

Application Name

MyCollegueas

Problem Description

SVG background looks great in the web renderer while in the winui3 it's nog looking so good. I noticed this difference while building widgets for windows 11. See screenshot and card json below

Screenshots

In the designer; this is also how it looked in the old web based widget board

In the new winui3 widget board

as you see the background is no longer filling the entire card

Card JSON

Card json
`
{
  "type": "AdaptiveCard",
  "$schema": "http://adaptivecards.io/schemas/adaptive-card.json",
  "version": "1.6",
  "body": [

  ],
  "backgroundImage": {
    "url": "${if(equals($host.hostTheme,'light'), $root.LightBackground, $root.DarkBackground)}"
  }
}
`

Data json
`
{
  "LightBackground": "data:image/svg+xml;base64,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",
  "DarkBackground": "data:image/svg+xml;base64,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",
}
`

Sample Code Language

No response

Sample Code

No response

[Diegorro98]

This issue might be similar to #8987, which unfortunately hasn't received any response in over a year 😓.