Do not assign parent to solo/mute layout

src/gui/MixerChannelView.cpp

@@ -110,7 +110,7 @@ MixerChannelView::MixerChannelView(QWidget* parent, MixerView* mixerView, int ch
 	m_soloButton->setCheckable(true);
 	m_soloButton->setToolTip(tr("Solo this channel"));
 
-	QVBoxLayout* soloMuteLayout = new QVBoxLayout(this);
+	auto soloMuteLayout = new QVBoxLayout{};
 	soloMuteLayout->setContentsMargins(0, 0, 0, 0);
 	soloMuteLayout->setSpacing(0);
 	soloMuteLayout->addWidget(m_soloButton, 0, Qt::AlignHCenter);