tukz/Tukui — comment on commit e12f2cdfa12391c9b9ea44642aafa6b44e2f0b11
File: Tukui/core/functions.lua line 546
By SinaC:

LFD/LFR checkboxes bug fix:
replace by
if frame.SetDisabledCheckedTexture then
frame:SetDisabledCheckedTexture("Interface\\Buttons\\UI-CheckBox-Check-Disabled")
end