From 9e6cf73b4e96250e1bf241edf52bb0c8063544cc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rodrigo=20Gir=C3=A3o=20Serr=C3=A3o?=
 <5621605+rodrigogiraoserrao@users.noreply.github.com>
Date: Thu, 9 Mar 2023 17:46:29 +0000
Subject: [PATCH] Add magic comment.

Related comment: https://github.com/Textualize/textual/pull/2003\#discussion_r1131081129

Related PR: #2003.
---
 src/textual/driver.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/textual/driver.py b/src/textual/driver.py
index 0e8ac6412c..3aee951efe 100644
--- 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