1x1 widget support

[molikuner]

Use cases

• PWAs, at least with Firefox they are implemented by adding a widget to the home screen. This widget is 1x1 and looks like any other app.
• Utility apps that allow "instant" actions via 1x1 widgets. For example there are apps that allow the user to lock the screen by tapping on the widget.

To discuss (some things I thought about, may be more than the following)

• Should this be limited to 1x1 widgets?
  • only 1x1 widgets have the same size as normal icons and could seamlessly be shown with them
  • bigger widgets may have multiple function depending on where the user clicked
• Should the widgets be displayed in the Application list?
  • PWAs: makes sense
  • Utility apps: would be nice
  • Other widgets (like the clock): doesn't really makes sense and may be confusing for users

[markusfisch]

I definitely like to add widget support, even if it was only to have icons for PWAs. And having those 1x1 widgets in the application list would really be nice! I'll have a look at AppWidgetHost and AppWidgetHostView to see what it takes to add this.

[2br-2b]

PWAs are shortcuts, not widgets, so I think the implementation would be different than for 1x1 widgets than for pwas. They'd both be cool and it'd be nice to have both, but I think we need separate issues for the two (as I mentioned in #16).