Fix crash when recipe search results change mid-rebuild (#1012)

src/main/java/codechicken/nei/recipe/RecipePageManager.java

@@ -50,12 +50,13 @@ public class RecipePageManager {
 
         final int heightAvailable = this.container.getVisibleHeight();
         final int width = Math.max(166, this.handlerInfo.getWidth());
-        final int numRecipes = getNumRecipes();
+        final List<Integer> searchRecipes = this.handler.getFilteredRecipes();
+        final int numRecipes = searchRecipes.size();
         List<Widget> widgets = new ArrayList<>();
         int shiftY = 0;
 
         for (int i = 0; i < numRecipes; i++) {
-            final int recipeIndex = this.handler.ref(i);
+            final int recipeIndex = searchRecipes.get(i);
             final NEIRecipeWidget widget = RecipeHandlerRef.of(this.handler.original, recipeIndex).getRecipeWidget();
             widget.w = width;
 

src/main/java/codechicken/nei/recipe/SearchRecipeHandler.java

@@ -97,6 +97,22 @@ class SearchRecipeHandler<H extends IRecipeHandler> {
         this.searchRecipes = searchRecipes;
     }
 
+    public List<Integer> getFilteredRecipes() {
+
+        if (this.searchRecipes == null) {
+            return this.filteredRecipes;
+        }
+
+        final List<Integer> search = this.searchRecipes;
+        final List<Integer> resolved = new ArrayList<>(search.size());
+
+        for (int idx : search) {
+            resolved.add(this.filteredRecipes.get(idx));
+        }
+
+        return resolved;
+    }
+
     public int ref(int index) {
 
         if (searchRecipes != null) {