command/partition: apply replay_gain_mode on "moveoutput"

"moveoutput" reverted the "replay_gain_mode" to OFF.

Another bug fix necessary for #2497

Author: MaxKellermann

src/command/PartitionCommands.cxx

@@ -161,7 +161,8 @@ handle_moveoutput(Client &client, Request request, Response &response)
 	else
 		/* copy the AudioOutputControl and add it to the output list */
 		dest_partition.outputs.AddMoveFrom(std::move(*output),
-						   was_enabled);
+						   was_enabled,
+						   dest_partition.replay_gain_mode);
 
 	instance.EmitIdle(IDLE_OUTPUT);
 	return CommandResult::OK;

src/output/MultipleOutputs.cxx

@@ -114,13 +114,15 @@ MultipleOutputs::FindByName(const std::string_view name) noexcept
 
 void
 MultipleOutputs::AddMoveFrom(AudioOutputControl &&src,
-			     bool enable) noexcept
+			     bool enable,
+			     ReplayGainMode replay_gain_mode) noexcept
 {
 	// TODO: this operation needs to be protected with a mutex
 	outputs.push_back(std::make_unique<AudioOutputControl>(std::move(src),
 							       client));
 
 	outputs.back()->LockSetEnabled(enable);
+	outputs.back()->SetReplayGainMode(replay_gain_mode);
 
 	client.ApplyEnabled();
 }

src/output/MultipleOutputs.hxx

@@ -110,8 +110,8 @@ public:
 	}
 
 	void AddMoveFrom(AudioOutputControl &&src,
-			 bool enable) noexcept;
-
+			 bool enable,
+			 ReplayGainMode replay_gain_mode) noexcept;
 
 	void SetReplayGainMode(ReplayGainMode mode) noexcept;