chore(Server.attached_sessions): Use .filter() (#538)

Follow up to #537

CHANGES

@@ -15,6 +15,12 @@ $ pip install --user --upgrade --pre libtmux
 
 <!-- To maintainers and contributors: Please add notes for the forthcoming version above -->
 
+### Bug fix
+
+- {attr}`Server.attached_sessions` fix for when multiple clients attached, thank you @patrislav1 (#537)
+
+  - #538 fix to `QueryList`.
+
 ## libtmux 0.35.0 (2024-03-17)
 
 ### Breaking changes

src/libtmux/server.py

@@ -260,7 +260,7 @@ def attached_sessions(self) -> t.List[Session]:
         -------
         list of :class:`Session`
         """
-        return [s for s in self.sessions if s.session_attached != "0"]
+        return self.sessions.filter(session_attached__noeq="1")
 
     def has_session(self, target_session: str, exact: bool = True) -> bool:
         """Return True if session exists.