I have Ubuntu 16.04 with GNOME shell. I set ctrl+shift for the "Modifiers-only switch to next source" option.
This shortcut conflicts with apps hot-keys. I can't use ctrl+shift+i for open devtools in Chrome, it just switch a layout. In VS code IDE if I press shortcuts with ctrl+shift (ctrl+shift+f etc.), shortcuts work but always switch a keyboard layout. When I used windows this problem didn't exist.
Can I set that the ctrl+shift shortcut causes a switch action only on keys release and only if this 2 keys was pressed (without additional keys).