Cannot Dismiss Welcome Modal in IE11

[gwwar]

Describe the bug
The new welcome modal doesn't appear to be dismissible when clicking on the x, or background overlay in IE11

To reproduce
Steps to reproduce the behavior:

1. Make sure the NUX welcome will display for a user. wp.data.dispatch( 'core/nux' ).enableTips()
2. When viewing in IE 11 try to click on the x or background overlay

Expected behavior
Modal dismisses

Additional context

• Tested on master (b2ef0f5) using BrowserStack (Windows 10 / IE11)

[tellthemachines]

Can confirm this is happening on Windows 10 / IE 11. Button is not clickable on hover, but can be tabbed to with the keyboard. The culprit is the margin-top: -56px set on components-guide_container which causes the container to overlay the button so that it becomes unclickable.

Closing on click outside is broken for all modals on IE, so must be an issue with the Modal component, or possibly withFocusOutside.

[aduth]

I'll plan to take a look at this today, if nobody's claimed it yet.

[aduth]

Fixes proposed at #19201