An about box. This is a dialog box with the application's icon, name,
version number, and copyright, plus a button to show licenses for software
used by the application.
An about box. This is a dialog box with the application's icon, name,
version number, and copyright, plus a button to show licenses for software
used by the application.
The default implementation of a MarkdownTapHandler.
It simply tries to open the URL with a system handler.
Does nothing if the URL scheme is not supported by the system.