public Builder mergeFrom(com.github.jsdossier.proto.HtmlRenderSpec other) {
   if (other == com.github.jsdossier.proto.HtmlRenderSpec.getDefaultInstance()) return this;
   if (other.hasResources()) {
     mergeResources(other.getResources());
   }
   if (other.hasTitle()) {
     bitField0_ |= 0x00000002;
     title_ = other.title_;
     onChanged();
   }
   if (other.hasContent()) {
     mergeContent(other.getContent());
   }
   if (other.hasIndex()) {
     mergeIndex(other.getIndex());
   }
   this.mergeUnknownFields(other.getUnknownFields());
   return this;
 }