RE: Move frames to and from scratchpad

>   After trying several combinations, I found one that correctly brings a frame from scratchpad to the background frame:
> In Lua console:    _:screen_of():mx_current():current():current():attach(_sub)
> In a key binding: kpress(META.."Shift+k", "_:screen_of():mx_current():current():current():attach(_)"),
> 

There may or may not be a WGroupWS layer present between a WScreen and a WTiling, making this sort of maneuver even more difficult.  If you are over a floating workspace, or you created a tiling workspace with the following command, your way of attaching to it will fail:

_:screen_of:attach_new{type="WTiling"}

I have been using this function to do what you are trying to do.  (Though someone else might anticipate further cases where mine also fails, like a WClientWin attached (unframed) to a WGroupWS.)

function send_to_or_from_sp(cwin, jumpto)
    local sp=ioncore.lookup_region("*scratchpad*", "WFrame")
    if cwin:parent()==sp then
	local scr=cwin:screen_of()
	local destws=scr:mx_current()
	local destwstype=obj_typename(destws)
	if destwstype=="WTiling" then
	    destws:current():attach(cwin)
	elseif destwstype=="WGroupWS" and obj_typename(destws:current())=="WTiling" then
	    destws:current():current():attach(cwin)
	elseif destwstype=="WGroupWS" then
	    destws:attach_framed(cwin)
	end
	mod_sp.set_shown_on(scr, 'unset')
    else
	sp:attach(cwin)
    end

    if jumpto then
	cwin:goto()
    end
end

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