feat: Implemented Inventory::can_move

- Changed Inventory::can_fit signature
- Added can_move_item test

src/inventory/mod.rs

@@ -15,7 +15,7 @@ impl Inventory {
     pub fn can_fit(
         &self,
         item_query: Query<&item::Item>,
-        contained_items: &Children,
+        contained_items: &[Entity],
         queried_size: UVec2,
         queried_position: UVec2,
     ) -> bool {
@@ -36,4 +36,21 @@ impl Inventory {
         }
         true
     }
+
+    pub fn can_move(
+        &self,
+        item_query: Query<&item::Item>,
+        contained_items: &[Entity],
+        queried_item: Entity,
+        queried_position: UVec2,
+    ) -> bool {
+        let Ok(item::Item {size, ..}) = item_query.get(queried_item) else {
+            error!("Could not query inventory child ({queried_item}), probably not item?");
+            return false;
+        };
+        let children = contained_items.iter()
+            .filter_map(|e| if e.ne(&&queried_item) { Some(*e) } else { None })
+            .collect::<Vec<Entity>>();
+        self.can_fit(item_query, children.as_slice(), *size, queried_position)
+    }
 }