> You should listen to frame_managed_changed_hook. No need to make
> new bindings, just check when a frame becomes empty in that hook.
> min_tabs.lua from the scripts repository might provide some useful
> bits.

Thanks - I did just this, but face yet another issue, this time with the 
below code:

local function close_empty_frame(ftable)
    if ftable.mode ~= 'remove' then return end
    local wmp = ftable.reg
    -- Should probably test that wmp is not nil here - or is it guaranteed 
to contain sth meaningful ?
    if WMPlex.mx_count(wmp) == 0 then

local hk=ioncore.get_hook("frame_managed_changed_hook")

Now the code does not hang anymore, but I get "ion3: Attempt to call an 
unsafe function "rqclose" in restricted mode." each time I close the last 
client in a frame.

I thought ioncore.defer would do the trick and defer the execution of the 
rqclose until I am back in the main loop (so probably out of "restricted" 
mode), but it looks like it does not... What am I still missing ?


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