Fix handling of disabled recipes (#130)

Always show empty boxes for both the ingredients and products of disabled recipes. 
That is, they'll always look like this:

![image](https://github.com/have-fun-was-taken/yafc-ce/assets/21223975/d60eeefa-f56d-4d9c-afc7-7dcd8759f784)

I also discovered the code that cleans up old links removes links if the
item/fluid does not appear in any _enabled_ recipes. I wanted the links
to stay put when disabling and enabling recipes, and I couldn't
concentrate on #122 with that behavior, so I changed the code to
consider all recipes. If that change (f28d35f) should be discussed more,
I can remove it from this PR.

Yafc.Model/Model/ProductionTable.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using System.Runtime.CompilerServices;
 using System.Threading.Tasks;
 using Google.OrTools.LinearSolver;
@@ -130,6 +131,24 @@ public bool Search(SearchQuery query) {
             return false;
         }
 
+        /// <summary>
+        /// Get all <see cref="RecipeRow"/>s contained in this <see cref="ProductionTable"/>, in a depth-first ordering. (The same as in the UI when all nested tables are expanded.)
+        /// </summary>
+        public IEnumerable<RecipeRow> GetAllRecipes() {
+            return flatten(recipes);
+
+            static IEnumerable<RecipeRow> flatten(IEnumerable<RecipeRow> rows) {
+                foreach (var row in rows) {
+                    yield return row;
+                    if (row.subgroup is not null) {
+                        foreach (var row2 in flatten(row.subgroup.GetAllRecipes())) {
+                            yield return row2;
+                        }
+                    }
+                }
+            }
+        }
+
         private static void AddFlow(RecipeRow recipe, Dictionary<Goods, (double prod, double cons)> summer) {
             foreach (var product in recipe.recipe.products) {
                 _ = summer.TryGetValue(product.goods, out var prev);
@@ -316,7 +335,7 @@ public override async Task<string> Solve(ProjectPage page) {
             foreach (var link in allLinks) {
                 link.notMatchedFlow = 0f;
                 if (!link.flags.HasFlags(ProductionLink.Flags.HasProductionAndConsumption)) {
-                    if (!link.flags.HasFlagAny(ProductionLink.Flags.HasProductionAndConsumption)) {
+                    if (!link.flags.HasFlagAny(ProductionLink.Flags.HasProductionAndConsumption) && !link.owner.HasDisabledRecipeReferencing(link.goods)) {
                         _ = link.owner.RecordUndo(true).links.Remove(link);
                     }
 
@@ -448,6 +467,14 @@ public override async Task<string> Solve(ProjectPage page) {
             return builtCountExceeded ? "This model requires more buildings than are currently built" : null;
         }
 
+        /// <summary>
+        /// Search the disabled recipes in this table and see if any of them produce or consume <paramref name="goods"/>. If they do, the corresponding <see cref="ProductionLink"/> should not be deleted.
+        /// </summary>
+        /// <param name="goods">The <see cref="Goods"/> that might have its link removed.</param>
+        /// <returns><see langword="true"/> if the link should be preserved, or <see langword="false"/> if it is ok to delete the link.</returns>
+        private bool HasDisabledRecipeReferencing(Goods goods)
+            => GetAllRecipes().Any(row => !row.hierarchyEnabled && row.recipe.ingredients.Any(i => i.goods == goods) || row.recipe.products.Any(p => p.goods == goods) || row.fuel == goods);
+
         private bool CheckBuiltCountExceeded() {
             bool builtCountExceeded = false;
             for (int i = 0; i < recipes.Count; i++) {

Yafc.Model/Model/ProductionTableContent.cs

@@ -177,7 +177,14 @@ public class RecipeRow : ModelObject<ProductionTable>, IModuleFiller, IGroupedEl
         public RecipeLinks links { get; internal set; }
         public float fixedBuildings { get; set; }
         public int? builtBuildings { get; set; }
+        /// <summary>
+        /// If <see langword="true"/>, the enabled checkbox for this recipe is checked.
+        /// </summary>
         public bool enabled { get; set; } = true;
+        /// <summary>
+        /// If <see langword="true"/>, the enabled checkboxes for this recipe and all its parent recipies are checked.
+        /// If <see langword="false"/>, at least one enabled checkbox for this recipe or its ancestors is unchecked.
+        /// </summary>
         public bool hierarchyEnabled { get; internal set; }
         public int tag { get; set; }
 

Yafc/Workspace/ProductionTable/ProductionTableView.cs

@@ -401,8 +401,8 @@ public override void BuildElement(ImGui gui, RecipeRow recipe) {
                 else {
                     for (int i = 0; i < recipe.recipe.ingredients.Length; i++) {
                         var ingredient = recipe.recipe.ingredients[i];
-                        var link = recipe.links.ingredients[i];
-                        var goods = recipe.links.ingredientGoods[i];
+                        var link = recipe.hierarchyEnabled ? recipe.links.ingredients[i] : null;
+                        var goods = recipe.hierarchyEnabled ? ingredient.goods : null;
                         grid.Next();
                         view.BuildGoodsIcon(gui, goods, link, (float)(ingredient.amount * recipe.recipesPerSecond), ProductDropdownType.Ingredient, recipe, recipe.linkRoot, ingredient.variants);
                     }
@@ -420,8 +420,10 @@ public override void BuildElement(ImGui gui, RecipeRow recipe) {
                 else {
                     for (int i = 0; i < recipe.recipe.products.Length; i++) {
                         var product = recipe.recipe.products[i];
+                        var link = recipe.hierarchyEnabled ? recipe.links.products[i] : null;
+                        var goods = recipe.hierarchyEnabled ? product.goods : null;
                         grid.Next();
-                        view.BuildGoodsIcon(gui, product.goods, recipe.links.products[i], (float)(recipe.recipesPerSecond * product.GetAmount(recipe.parameters.productivity)), ProductDropdownType.Product,
+                        view.BuildGoodsIcon(gui, goods, link, (float)(recipe.recipesPerSecond * product.GetAmount(recipe.parameters.productivity)), ProductDropdownType.Product,
                             recipe, recipe.linkRoot);
                     }
                 }
@@ -459,7 +461,7 @@ public override void BuildElement(ImGui gui, RecipeRow recipe) {
                 using var grid = gui.EnterInlineGrid(3f);
                 if (recipe.parameters.modules.modules == null || recipe.parameters.modules.modules.Length == 0) {
                     grid.Next();
-                    if (gui.BuildFactorioObjectWithAmount(null, 0, UnitOfMeasure.None)) {
+                    if (gui.BuildFactorioObjectWithAmount(null, 0, UnitOfMeasure.None) && recipe.hierarchyEnabled) {
                         ShowModuleDropDown(gui, recipe);
                     }
                 }
@@ -886,7 +888,7 @@ private void BuildGoodsIcon(ImGui gui, Goods goods, ProductionLink link, float a
                 textColor = SchemeColor.BackgroundTextFaint;
             }
 
-            if (gui.BuildFactorioObjectWithAmount(goods, amount, goods?.flowUnitOfMeasure ?? UnitOfMeasure.None, iconColor, textColor)) {
+            if (gui.BuildFactorioObjectWithAmount(goods, amount, goods?.flowUnitOfMeasure ?? UnitOfMeasure.None, iconColor, textColor) && goods is not null) {
                 OpenProductDropdown(gui, gui.lastRect, goods, amount, link, dropdownType, recipe, context, variants);
             }
         }