The code for gala has been merged from here https://code.launchpad.net/~gala-dev/gala/keybinding-input-sources/+merge/252973 so people should be able to use <Shift>space to switch Layouts now.
The code for gala has been merged from here https:/ /code.launchpad .net/~gala- dev/gala/ keybinding- input-sources/ +merge/ 252973 so people should be able to use <Shift>space to switch Layouts now.