LUA Code GetBindingAction

[Blandros]

Hello,
i am trying to revive an old Addon (KeyBinder). I only have little knowledge about LUA coding. But somehow I've managed it quite well so far.

But i‘ve came around the problem that only the Keys 1, 2, 3, …, 8, 9, with ACTIONBUTTON1, ACTIONBUTTON2, etc. are working.
The other keys for example Q with MULTIACTIONBAR4BUTTON11 arent working.

-- SetKey(button) - Determines the texture or text displayed on the button based on the key binding.
function addon:SetKey(button)
    local spell = GetBindingAction(modif.CTRL .. modif.SHIFT .. modif.ALT .. (button.label:GetText() or "")) or ""
 
    if spell:find("^SPELL") then
        button.icon:Show()
        spell = spell:match("SPELL%s(.*)")
        button.icon:SetTexture(GetSpellTexture(spell))
        button.icon:SetTexCoord(0.1, 0.9, 0.1, 0.9)
        button.type = "spell"
    elseif spell:find("^MACRO") then
        button.icon:Show()
        spell = spell:match("MACRO%s(.*)")
        button.icon:SetTexture(select(2, GetMacroInfo(spell)))
        button.icon:SetTexCoord(0.1, 0.9, 0.1, 0.9)
        button.type = "macro"
    elseif spell:find("^ITEM") then
        button.icon:Show()
        spell = spell:match("ITEM%s(.*)")
        button.icon:SetTexture(select(10, GetItemInfo(spell)))
        button.icon:SetTexCoord(0.1, 0.9, 0.1, 0.9)
        button.type = "item"
    else
        button.icon:Hide()
        local found = false
        for i = 1, GetNumBindings() do
            local a = GetBinding(i)
            if spell:find(a) then
                local slot = spell:match("ACTIONBUTTON(%d+)") or spell:match("BT4Button(%d+)")
 
                if slot then
                    button.icon:SetTexture(GetActionTexture(slot))
                    button.icon:SetTexCoord(0.1, 0.9, 0.1, 0.9)
                    button.icon:Show()
                    button.slot = slot
                end
                spell = GetBindingText(spell, "BINDING_NAME_") or spell
                button.type = "interface"
                found = true
            end
        end
        if not found then
            button.type = "none"
        end
    end
    button.macro:SetText(spell)
end

[Blandros]

I got it working:
https://legacy.curseforge.com/wow/addons/keyui