Fix incremental mount for LithoViews with children with Transient State

Summary:
LithoView is a ViewGroup. ViewGroups have transient state if they directly have transient state or if any of their children have transient state. This applies the same incremental mount fix to children updating transient state as the LithoView directly updating transient state.

Note: I think this fix kinda sucks, because it means we mount the whole thing immediately if any child in the hierarchy has transient state at any point. We should try to figure out something nicer. This is a decent fix for now.

Reviewed By: pasqualeanatriello

Differential Revision: D5139234

fbshipit-source-id: 5d1f399607176bb90ed96e916ebe9b8015b0e075

litho-core/src/main/java/com/facebook/litho/LithoView.java

@@ -376,6 +376,15 @@ public void setHasTransientState(boolean hasTransientState) {
     super.setHasTransientState(hasTransientState);
   }
 
+  @Override
+  public void childHasTransientStateChanged(View child, boolean childHasTransientState) {
+    if (isIncrementalMountEnabled()) {
+      performIncrementalMount(null);
+    }
+
+    super.childHasTransientStateChanged(child, childHasTransientState);
+  }
+
   @Override
   public void offsetTopAndBottom(int offset) {
     super.offsetTopAndBottom(offset);