Comment 2 for bug 272606

Here is xev for dot in numeric key (above enter):

KeyRelease event, serial 33, synthetic NO, window 0x3000001,
    root 0x5c, subw 0x0, time 869347, (521,363), root:(525,412),
    state 0x10, keycode 129 (keysym 0xffac, KP_Separator), same_screen YES,
    XLookupString gives 1 bytes: (2c) ","
    XFilterEvent returns: False

And here it's for comma (beside enter):

KeyRelease event, serial 33, synthetic NO, window 0x3000001,
    root 0x5c, subw 0x0, time 990964, (769,432), root:(773,505),
    state 0x10, keycode 91 (keysym 0xffac, KP_Separator), same_screen YES,
    XKeysymToKeycode returns keycode: 129
    XLookupString gives 1 bytes: (2c) ","
    XFilterEvent returns: False