No way to encode current input source
With the deprecation of org.gnome.desktop.input-sources.current
https://gitlab.gnome.org/GNOME/gsettings-desktop-schemas/blob/master/schemas/org.gnome.desktop.input-sources.gschema.xml.in#L14 , there is no way to set or to find out the current input source via gsettings.
The other properties offer no indication how the current input source should be determined.
This makes it difficult for applications like on-screen keyboards to switch and respond to the switching of layouts.
It would be nice if it was clarified how exactly to switch layouts in absence of an explicit current
field.