Add copy with to modlist

lib/mod_list.dart

@@ -407,38 +407,38 @@ class ModList {
     // Find groups of mods that can be reordered without breaking constraints
     List<List<String>> groups = [];
     List<String> currentGroup = [];
-    
+
     for (int i = 0; i < order.length; i++) {
       String modId = order[i];
       Mod mod = mods[modId]!;
-      
+
       if (currentGroup.isEmpty) {
         currentGroup.add(modId);
         continue;
       }
-      
+
       // Check if this mod can join the current group
       bool canJoin = true;
       for (String groupModId in currentGroup) {
         Mod groupMod = mods[groupModId]!;
-        
+
         // Check hard dependencies
-        if (mod.dependencies.contains(groupModId) || 
+        if (mod.dependencies.contains(groupModId) ||
             groupMod.dependencies.contains(modId)) {
           canJoin = false;
           break;
         }
-        
+
         // Check soft constraints
-        if (mod.loadAfter.contains(groupModId) || 
+        if (mod.loadAfter.contains(groupModId) ||
             groupMod.loadBefore.contains(modId) ||
-            mod.loadBefore.contains(groupModId) || 
+            mod.loadBefore.contains(groupModId) ||
             groupMod.loadAfter.contains(modId)) {
           canJoin = false;
           break;
         }
       }
-      
+
       if (canJoin) {
         currentGroup.add(modId);
       } else {
@@ -449,25 +449,25 @@ class ModList {
         }
       }
     }
-    
+
     // Add the last group if not empty
     if (currentGroup.isNotEmpty) {
       groups.add(currentGroup);
     }
-    
+
     // Sort each group by size
     for (List<String> group in groups) {
       if (group.length > 1) {
         group.sort((a, b) => mods[b]!.size.compareTo(mods[a]!.size));
       }
     }
-    
+
     // Reconstruct the order
     List<String> result = [];
     for (List<String> group in groups) {
       result.addAll(group);
     }
-    
+
     return result;
   }
 
@@ -501,6 +501,21 @@ class ModList {
     }
     return generateLoadOrder();
   }
+
+  ModList copyWith({
+    String? configPath,
+    String? modsPath,
+    Map<String, Mod>? mods,
+    Map<String, bool>? activeMods,
+  }) {
+    final newModlist = ModList(
+      configPath: configPath ?? this.configPath,
+      modsPath: modsPath ?? this.modsPath,
+    );
+    newModlist.mods = mods ?? this.mods;
+    newModlist.activeMods = activeMods ?? this.activeMods;
+    return newModlist;
+  }
 }
 
 String _expansionNameFromId(String id) {