Add magic comment. (#2010)

Related comment: https://github.com/Textualize/textual/pull/2003\#discussion_r1131081129 Related PR: #2003.
Textualize · Mar 9, 2023 · 48dbe12 · 48dbe12
1 parent 503c037
commit 48dbe12
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/src/textual/driver.py b/src/textual/driver.py
@@ -55,6 +55,7 @@ def process_event(self, event: events.Event) -> None:
                 and not event.button
                 and self._last_move_event is not None
             ):
+                # Deduplicate self._down_buttons while preserving order.
                 buttons = list(dict.fromkeys(self._down_buttons).keys())
                 self._down_buttons.clear()
                 move_event = self._last_move_event