Same problem after Ubuntu Gnome 15.04 clean installation. Shortcut
Modifiers-only switch to next source(allow set combinations like
Shift+Alt) works incorrect. Switch to next input source and Switch
to previous input source works fine, but doesn't allow set combinations
like Shift+Alt through GUI.
Ubuntu 13.10. I use colemak and russian layouts. After fix this bug,
hotkeys in russian layout work like by using qwerty. I press different
hardware keys for the same hotkey combination in different layouts. In
ubuntu 12.04 it works fine, the same hardware keys for russian and
colemak layouts.
