Clear preview on blacklist, right-click doesn't change selection

- Blacklisting a tag or post clears the preview
- Right-click shows context menu without selecting/activating post

booru_viewer/gui/app.py

@@ -1268,11 +1268,15 @@ class BooruApp(QMainWindow):
             tag = action.text()
             self._db.add_blacklisted_tag(tag)
             self._db.set_setting("blacklist_enabled", "1")
+            self._preview.clear()
             self._status.showMessage(f"Blacklisted: {tag}")
+            self._last_activated_index = -1
             self._do_search()
         elif action == bl_post_action:
             self._db.add_blacklisted_post(post.file_url)
+            self._preview.clear()
             self._status.showMessage(f"Post #{post.id} blacklisted")
+            self._last_activated_index = -1
             self._do_search()
 
     @staticmethod

booru_viewer/gui/grid.py

@@ -374,10 +374,8 @@ class ThumbnailGrid(QScrollArea):
 
     def _on_thumb_right_click(self, index: int, pos) -> None:
         if self._multi_selected and index in self._multi_selected:
-            # Right-click on multi-selected: bulk context menu
             self.multi_context_requested.emit(sorted(self._multi_selected), pos)
         else:
-            self._select(index)
             self.context_requested.emit(index, pos)
 
     def select_all(self) -> None: