fix: hide WAYLAND_DISPLAY during mpv init so it uses X11 wid embedding

main.py

@@ -468,11 +468,19 @@ class MpvWidget(QFrame):
     def _init_player(self):
         if self._player is not None:
             return
+        # Temporarily hide WAYLAND_DISPLAY so mpv picks X11 output and
+        # respects the wid parameter (X11 window ID). Without this, mpv
+        # detects Wayland via the environment and opens its own window.
+        _wd = os.environ.pop("WAYLAND_DISPLAY", None)
+        try:
             self._player = mpv.MPV(
                 wid=str(int(self.winId())),
                 keep_open=True,
                 pause=True,
             )
+        finally:
+            if _wd is not None:
+                os.environ["WAYLAND_DISPLAY"] = _wd
         # mpv fires events on its own thread; bounce to Qt thread via QTimer.
         @self._player.event_callback("file-loaded")
         def _on_file_loaded(event):