select *all* threads

fixes #4565
// FREEBIE

src/org/thoughtcrime/securesms/ConversationListAdapter.java

@@ -160,7 +160,7 @@ public class ConversationListAdapter extends CursorRecyclerViewAdapter<Conversat
 
   public void selectAllThreads() {
     for (int i = 0; i < getItemCount(); i++) {
-      batchSet.add(getItemId(i));
+      batchSet.add(getThreadRecord(getCursorAtPositionOrThrow(i)).getThreadId());
     }
     this.notifyDataSetChanged();
   }

src/org/thoughtcrime/securesms/ConversationListFragment.java

@@ -225,7 +225,7 @@ public class ConversationListFragment extends Fragment
   private void handleSelectAllThreads() {
     getListAdapter().selectAllThreads();
     actionMode.setSubtitle(getString(R.string.conversation_fragment_cab__batch_selection_amount,
-                           ((ConversationListAdapter)this.getListAdapter()).getBatchSelections().size()));
+                           getListAdapter().getBatchSelections().size()));
   }
 
   private void handleCreateConversation(long threadId, Recipients recipients, int distributionType) {