[UWP][InputValidation] Crash when using popup show cards

[RebeccaAnne]

Platform

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

• UWP

Details

When setting show card mode to "actionMode": "popup", rather than inline, the renderer crashes when clicking on a show card button.

Host Config Json snippit:

"actions": {
	"maxActions": 5,
	"spacing": "default",
	"buttonSpacing": 10,
	"showCard": {
		"actionMode": "popup",
		"inlineTopMargin": 16
	},
	"actionsOrientation": "horizontal",
	"actionAlignment": "stretch"
},

[RebeccaAnne]

We need to spec what happens when show cards are set to popup.

[RebeccaAnne]

Spun off spec issue to #4369. This bug now tracks only the crash in UWP.

Hi @RebeccaAnne. We have acknowledged this issue report. Please continue to follow this issue for updates/progress/questions.