remove optimizestack call

src/main.lua

@@ -604,7 +604,7 @@ local function VP_moveto(x,z, cx,cz,direction)
     VP_movetoy(y, 0)
     return cx,cz,direction
 end
-local function VP_optimizestack(target)
+local function VP_optimizestack(target) -- partly deprecated for not working!
     -- go from top to bottom and erase false entries until we encounter a true one.
     local index = #target
     while #target > 0 do
@@ -636,7 +636,7 @@ local function VP_createstack(buf, dimensions)
                 -- ceiling
                 table.insert(tempbuf, buf[posasstring(_cx,cy,_cz)] ~= 2)
             end
-            VP_optimizestack(tempbuf)
+            --VP_optimizestack(tempbuf)
 
             if #tempbuf > 0 then out[posasstring(x,z)] = tempbuf end
         end