Further improve/fix Search interface. (#4391)

Author: dbrant

app/src/main/java/org/wikipedia/search/SearchResultsFragment.kt

@@ -154,9 +154,7 @@ class SearchResultsFragment : Fragment() {
 
     private inner class SearchResultsDiffCallback : DiffUtil.ItemCallback<SearchResult>() {
         override fun areItemsTheSame(oldItem: SearchResult, newItem: SearchResult): Boolean {
-            return oldItem.pageTitle.prefixedText == newItem.pageTitle.prefixedText &&
-                    oldItem.pageTitle.namespace == newItem.pageTitle.namespace &&
-                    oldItem.pageTitle.description == newItem.pageTitle.description
+            return false
         }
 
         override fun areContentsTheSame(oldItem: SearchResult, newItem: SearchResult): Boolean {

app/src/main/java/org/wikipedia/search/SearchResultsViewModel.kt

@@ -117,7 +117,7 @@ class SearchResultsViewModel : ViewModel() {
                     }
                 }
 
-                return LoadResult.Page(resultList.distinctBy { it.pageTitle.prefixedText }, null, continuation)
+                return LoadResult.Page(resultList.distinctBy { it.pageTitle.prefixedText }, params.key, continuation)
             } catch (e: Exception) {
                 LoadResult.Error(e)
             }