[Bug Bash] [UWP] Input.Text isMultiline does not work

Platform

What platform is your issue or question related to? (Delete other platforms).

• UWP

Issue

UWP Input.Text isMultiline does not work

JS

{
	"$schema": "http://adaptivecards.io/schemas/adaptive-card.json",
	"type": "AdaptiveCard",
	"version": "1.0",
	"backgroundImage": "Assets/background.png",
	"body": [
		{
			"type": "Image",
			"url": "Assets/Adaptive10.png",
			"altText": "Adaptive cards 1.0 logo"
		}
	],
	"actions": [
		{
			"type": "Action.ShowCard",
			"title": "Open Card",
			"iconUrl": "Assets/Adaptive10.png",
			"card": {
				"type": "AdaptiveCard",
				"body": [
					{
						"type": "Input.Text",
						"id": "comment",
						"isMultiline": true,
						"placeholder": "Enter your comment"
					}
				],
				"actions": [
					{
						"type": "Action.Submit",
						"iconUrl": "Assets/Adaptive10.png",
						"title": "OK"
					}
				]
			}
		}
	]
}

No source file or test is named. Start by reproducing the supplied Adaptive Card JSON on UWP and inspect how the Input.Text isMultiline property is handled. Done means an Input.Text with isMultiline set to true visibly accepts multiple lines.