Use default value for stable ids if RecyclerBinder doesn't specify st…

…able ids behavior

Summary:
We want to make the `stableIds` configuration to be controlled via the `ComponentsConfiguration` (so we can enable it in specific surfaces).

The first step is to make sure we get it from the current static value only if the client has not specified it on the `RecyclerBinderConfig`.

Differential Revision: D58729254

fbshipit-source-id: 84380fa26e004ea68ad827668927b59cb23c9133

litho-widget/src/main/java/com/facebook/litho/widget/RecyclerBinder.java

@@ -704,8 +704,20 @@ private RecyclerBinder(Builder builder) {
     mParentLifecycle = builder.lifecycleProvider;
 
     mComponentTreeHolderFactory = builder.componentTreeHolderFactory;
+
+    /*
+     This is a work-around to use the client explicit config, or if that hasn't happened to resort
+     to the one defined in the ComponentsConfiguration. We have to use this approach because atm the
+     [RecyclerBinderConfig] has an optional components configuration.
+    */
+    boolean enableStableIdsToUse =
+        mRecyclerBinderConfig.enableStableIds != null
+            ? mRecyclerBinderConfig.enableStableIds
+            : ComponentsConfiguration.defaultRecyclerBinderUseStableId;
+
     // we cannot enable circular list and stable id at the same time
-    mEnableStableIds = (!mRecyclerBinderConfig.isCircular && mRecyclerBinderConfig.enableStableIds);
+    mEnableStableIds = (!mRecyclerBinderConfig.isCircular && enableStableIdsToUse);
+
     mRecyclerBinderAdapterDelegate =
         builder.adapterDelegate != null
             ? builder.adapterDelegate

litho-widget/src/main/java/com/facebook/litho/widget/RecyclerBinderConfig.kt

@@ -157,10 +157,10 @@ data class RecyclerBinderConfig(
     @JvmField val rangeRatio: Float = DEFAULT_RANGE_RATIO,
     /**
      * If set, the RecyclerView adapter will have stableId support turned on. Please note that this
-     * configuration will be disregarded in case [isCircular] is set to `true`.
+     * configuration will be disregarded in case [isCircular] is set to `true`. If not set, it will
+     * follow the default value set for the [ComponentsConfiguration]
      */
-    @JvmField
-    val enableStableIds: Boolean = ComponentsConfiguration.defaultRecyclerBinderUseStableId,
+    @JvmField val enableStableIds: Boolean? = null,
     /**
      * If true, the [RecyclerBinder] will measure the parent height by the height of children if the
      * orientation is vertical, or measure the parent width by the width of children if the