Adapt find_new_position is WIP. Cleaning up comments.

src/libnest2d/include/libnest2d/selections/firstfit.hpp

@@ -39,6 +39,15 @@ public:
 
         std::vector<Placer> placers;
         placers.reserve(last-first);
+        
+        std::for_each(first, last, [this](Item& itm) {
+            if(itm.isFixed()) {
+                if(packed_bins_.empty()) packed_bins_.emplace_back();
+                packed_bins_.front().emplace_back(itm);
+            } else {
+                store_.emplace_back(itm);
+            }
+        });
 
         // If the packed_items array is not empty we have to create as many
         // placers as there are elements in packed bins and preload each item
@@ -49,8 +58,6 @@ public:
             placers.back().preload(ig);
         }
 
-        std::copy(first, last, std::back_inserter(store_));
-
         auto sortfunc = [](Item& i1, Item& i2) {
             return i1.area() > i2.area();
         };
@@ -76,7 +83,6 @@ public:
             }
         }
 
-
         auto it = store_.begin();
 
         while(it != store_.end() && !cancelled()) {