Fix up incompatibilities

lib/mod_list.dart

@@ -252,7 +252,10 @@ class ModList {
   LoadOrder generateLoadOrder([LoadOrder? loadOrder]) {
     loadOrder ??= LoadOrder();
     final modMap = {for (final m in activeMods.values) m.id: m};
-    _validateIncompatibilities(loadOrder);
+    final errors = _validateIncompatibilities(modMap);
+    if (errors.isNotEmpty) {
+      loadOrder.errors.addAll(errors);
+    }
 
     // Hard dependency graph
     final inDegree = <String, int>{};
@@ -363,15 +366,16 @@ class ModList {
     return loadOrder;
   }
 
-  void _validateIncompatibilities(LoadOrder loadOrder) {
-    final enabledMods = loadOrder.order.where((m) => m.enabled).toList();
-    for (final mod in enabledMods) {
+  List<String> _validateIncompatibilities(Map<String, Mod> modMap) {
+    final errors = <String>[];
+    for (final mod in modMap.values) {
       for (final incompatibleId in mod.incompatibilities) {
-        if (enabledMods.any((m) => m.id == incompatibleId)) {
-          loadOrder.errors.add("Incompatible mods: ${mod.id} and $incompatibleId");
+        if (modMap.values.any((m) => m.id == incompatibleId)) {
+          errors.add("Incompatible mods: ${mod.id} and $incompatibleId");
         }
       }
     }
+    return errors;
   }
 
   void _updateReverseConstraints(