Fix arrangement with items larger or equal to bed dimesions.

fixes #2897 
fixes #1186

src/libnest2d/include/libnest2d/selections/selection_boilerplate.hpp

@@ -43,7 +43,10 @@ protected:
 
             Placer p{bin};
             p.configure(pcfg);
-            if (itm.area() <= 0 || !p.pack(cpy)) it = c.erase(it);
+            if (itm.area() <= 0 || !p.pack(cpy)) {
+                static_cast<Item&>(*it).binId(BIN_ID_UNSET);
+                it = c.erase(it);
+            }
             else it++;
         }
     }

src/libslic3r/Arrange.cpp

@@ -577,7 +577,7 @@ void _arrange(
         std::function<bool()>         stopfn)
 {
     // Integer ceiling the min distance from the bed perimeters
-    coord_t md = minobjd - 2 * scaled(0.1 + EPSILON);
+    coord_t md = minobjd;
     md = (md % 2) ? md / 2 + 1 : md / 2;
     
     auto corrected_bin = bin;