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Fushan Wen authored
When all players are closed, media player applet on the desktop still shows a track from the last player, and player control buttons are still clickable but have no effect. Add a new signal named `playerListEmptied()`. When the proxy list is empty, the signal is emitted and `m_multiplexer` is scheduled to be deleted, so the media player applet on the desktop can indicate the right status of no player opened. BUG: 446098 FIXED-IN: 5.24