Arch Linux

Description:
I use the right alt key to toggle between english and russian:

setxkbmap -option -option grp:toggle,grp_led:scroll,compose:menu,ctrl:nocaps "us,ru"

After upgrade of xkeyboard-config from 2.17-2 to 2.18-1 this no longer works: pressing right alt once switches language from english to russian, as expected. But consecutive press doesn't switch back.


Additional info:
xev shows that interpretation of the right alt key is different from 2.17. In 2.17 right alt gives the same key for both english and russian:

KeyRelease event, serial 33, synthetic NO, window 0x2a00001,
root 0xbf, subw 0x0, time 626557, (-367,343), root:(597,426),
state 0x2008, keycode 108 (keysym 0xffea, Alt_R), same_screen YES,
XLookupString gives 0 bytes:
XFilterEvent returns: False

In 2.18 this key is still Alt_R in english, but it has changed to Level3 in russian:

KeyRelease event, serial 34, synthetic NO, window 0x2c00001,
root 0xbf, subw 0x0, time 767811, (-454,839), root:(510,922),
state 0x2080, keycode 108 (keysym 0xfe03, ISO_Level3_Shift), same_screen YES,
XKeysymToKeycode returns keycode: 92
XLookupString gives 0 bytes:
XFilterEvent returns: False