Show error if trying to boost unboostables in TUI

toot/tui/app.py

@@ -497,6 +497,13 @@ class TUI(urwid.Frame):
             new_status = self.make_status(new_data)
             timeline.update_status(new_status)
 
+        # Check if status is rebloggable
+        no_reblog_because_private = status.visibility == "private" and not status.is_mine
+        no_reblog_because_direct = status.visibility == "direct"
+        if no_reblog_because_private or no_reblog_because_direct:
+            self.footer.set_error_message("You may not reblog this {} status".format(status.visibility))
+            return
+
         self.run_in_thread(
             _unreblog if status.reblogged else _reblog,
             done_callback=_done

toot/tui/entities.py

@@ -60,6 +60,7 @@ class Status:
         self.url = data.get("url")
         self.mentions = data.get("mentions")
         self.reblog = self._get_reblog()
+        self.visibility = data.get("visibility")
 
     @property
     def original(self):