they can still be put on the filesystem and will be read from there
preferentially, though overriding assets in this way can confuse
some creatively written apps and cause them to crash.
Some multi-platform apps accept cmdline options using the `-e` option
of `am`. For example, you can now use `-e unity='<unity cmdline>'`
to pass cmdline arguments to a unity game.
Most widgets want to draw something behind the default content.
If we replace SkArea with GskCanvas in the future, we could draw
the default content, when the super.onDraw() gets called.
This prevents overlay widgets from blocking touch events.
Androids ViewGroup.dispatchTouchEvent() loops over all children and only breaks if an eventhandler returns true. Gtk on the other hand stops at the first sensitive child. Even if the eventhandler returned false.
This replaces our custom subsurface implementation and has the
advantages, that the subsurface gets repositioned automatically and it
also supports underlay surfaces, so that the application can put control
widgets on top of the SurfaceView.
Our custom subsurface implementation will still be used for GL rendering
