Fix rendered custom objects in the editor with an overriding of children configuration (#7585)

- Fix children overriding to only apply to the default variant at runtime

GDJS/Runtime/CustomRuntimeObject.ts

@@ -105,7 +105,14 @@ namespace gdjs {
         return;
       }
 
-      let usedVariantData: EventsBasedObjectVariantData = eventsBasedObjectData;
+      if (!eventsBasedObjectData.defaultVariant) {
+        eventsBasedObjectData.defaultVariant = {
+          ...eventsBasedObjectData,
+          name: '',
+        };
+      }
+      let usedVariantData: EventsBasedObjectVariantData =
+        eventsBasedObjectData.defaultVariant;
       if (customObjectData.variant) {
         for (
           let variantIndex = 0;

GDJS/Runtime/CustomRuntimeObjectInstanceContainer.ts

@@ -80,7 +80,11 @@ namespace gdjs {
         ++i
       ) {
         const childObjectData = eventsBasedObjectVariantData.objects[i];
-        if (customObjectData.childrenContent) {
+        // The children configuration override only applies to the default variant.
+        if (
+          customObjectData.childrenContent &&
+          !eventsBasedObjectVariantData.name
+        ) {
           this.registerObject({
             ...childObjectData,
             // The custom object overrides its events-based object configuration.

GDJS/Runtime/types/project-data.d.ts

@@ -212,6 +212,9 @@ declare interface EventsBasedObjectData
   name: string;
   isInnerAreaFollowingParentSize: boolean;
   variants: Array<EventsBasedObjectVariantData>;
+  /** Added at runtime to have the default variant with an empty name instead
+   * of the events-based object name. */
+  defaultVariant?: EventsBasedObjectVariantData;
 }
 
 declare interface EventsBasedObjectVariantData extends InstanceContainerData {