super + double shift behaves as super + shift + l

[ncfavier]

My keyboard config is setxkbmap -layout 'fr,us,ru,gr' -variant 'oss,,phonetic_fr,' -option 'grp:shifts_toggle' so I can switch keyboard layouts by pressing both shift keys (pressing the left one first cycles to the right, and vice-versa). I have sxhkd 0.6.2 running as sxhkd -m 1, and I have a bind set up for super + shift + l.

When I press super, left shift and right shift simultaneously in that order, the super + shift + l bind is triggered and the layout cycles to the right. This is independent of the current layout.

When I press super, right shift and left shift simultaneously in that order, or super and just one shift, nothing happens.

This was especially fun when I did it accidentally because that bind happens to lock my screen, and you can guess what happened when I typed my password on a different keyboard layout.

I'm not sure what could be causing this, maybe Shift_L is confused with shift + l somewhere? Оr maybe ISO_Next_Group is interpreted as l somehow?

I get the same results with super + shift + L (uppercase).

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Debug output when I press super + left shift + right shift:

key press 46 81
key release 62 208
num active 0
key release 46 209
num active 0

and when I press super + left shift + l:

key press 46 81
key release 46 209
num active 0

It seems like sxhkd gets a key press event with keycode 46 (l) in both cases, so this is probably not an sxhkd bug... It's weird that xev does not report this though.