GitHub notification from extension does not wrap

Created by: sqs

Repro:

Run an extension that calls:

sourcegraph.app.activeWindow.showNotification(
                'To see HubSpot link info, you must visit https://api.hubapi.com/dummy and right-click the Sourcegraph toolbar icon to **Enable Sourcegraph on this domain**.',
                sourcegraph.NotificationType.Error
            )

(I.e., any long message.)

The text does not wrap:

I expect it to wrap.